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Unit 1, Lecture 1: "Little Man".
History of the field, current concepts, and future video lecture content
For more information, log on to-
http://shomusbiology.weebly.com/
Download the study materials here-
http://shomusbiology.weebly.com/bio-materials.html
Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 27833
For more information, log on to-
http://shomusbiology.weebly.com/
Download the study materials here-
http://shomusbiology.weebly.com/bio-materials.html
Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 16619
For more information, log on to-
http://shomusbiology.weebly.com/
Download the study materials here-
http://shomusbiology.weebly.com/bio-materials.html
Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2]
Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tissues that will later form the nervous system. The mesoderm is found between the ectoderm and the endoderm and gives rise to somites, which form muscle; the cartilage of the ribs and vertebrae; the dermis, the notochord, blood and blood vessels, bone, and connective tissue. The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas.[4] Following gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.[2][5]
The molecular mechanism and timing of gastrulation is different in different organisms. However, some common features of gastrulation across triploblastic organisms include: (1) A change in the topological structure of the embryo, from a simply connected surface (sphere-like), to a non-simply connected surface (torus-like); (2) the differentiation of cells into one of three types (endodermal, mesodermal, and ectodermal); and (3) the digestive function of a large number of endodermal cells.[6]
Lewis Wolpert, pioneering developmental biologist in the field, has been credited for noting that "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life."
The terms "gastrula" and "gastrulation" were coined by Ernst Haeckel, in his 1872 work "Biology of Calcareous Sponges".[7]
Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation: 1) invagination 2) involution 3) ingression 4) delamination 5) epiboly.[8] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 34931
Unit 1, Lecture 3: How the Maggot Gets Its Stripes.
Overview of the model organism Drosophila melanogaster
- published: 20 Dec 2013
- views: 39917
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertilization, morula, blastula and gastrula in step by step. It also explains the neurulation in frog and chick embryo. it explains the morphogenesis pattern in drosophila development.
For more information, log on to-
http://www.shomusbiology.com/
Get Shomu's Biology DVD set here-
http://www.shomusbiology.com/dvd-store/
Download the study materials here-
http://shomusbiology.com/bio-materials.html
Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology-
Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store
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Thank you for watching
- published: 01 Aug 2015
- views: 5909
Unit 1, Lecture 4: Sydney's Choice.
Overview of the model organism Caenorhabditis elegans
- published: 21 Feb 2014
- views: 25652
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content.
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.
- published: 24 Oct 2014
- views: 249325
For more information, log on to-
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Download the study materials here-
http://shomusbiology.weebly.com/bio-materials.html
During oogenesis, cytoplasmic bridges called "ring canals" connect the forming oocyte to nurse cells. Nutrients and developmental control molecules move from the nurse cells into the oocyte. In the figure to the left, the forming oocyte can be seen to be covered by follicular support cells.
After fertilization of the oocyte the early embryo (or syncytial embryo) undergoes rapid DNA replication and 13 nuclear divisions until approximately 5000 to 6000 nuclei accumulate in the unseparated cytoplasm of the embryo. By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nuclei, which will become the yolk nuclei). After the 10th division the pole cells form at the posterior end of the embryo, segregating the germ line from the syncytium. Finally, after the 13th division cell membranes slowly invaginate, dividing the syncytium into individual somatic cells. Once this process is completed gastrulation starts.[23]
Nuclear division in the early Drosophila embryo happens so quickly there are no proper checkpoints so mistakes may be made in division of the DNA. To get around this problem, the nuclei that have made a mistake detach from their centrosomes and fall into the centre of the embryo (yolk sac), which will not form part of the fly.
The gene network (transcriptional and protein interactions) governing the early development of the fruit fly embryo is one of the best understood gene networks to date, especially the patterning along the antero-posterior (AP) and dorso-ventral (DV) axes (See under morphogenesis).[23]
The embryo undergoes well-characterized morphogenetic movements during gastrulation and early development, including germ-band extension, formation of several furrows, ventral invagination of the mesoderm, posterior and anterior invagination of endoderm (gut), as well as extensive body segmentation until finally hatching from the surrounding cuticle into a 1st-instar larva.
During larval development, tissues known as imaginal discs grow inside the larva. Imaginal discs develop to form most structures of the adult body, such as the head, legs, wings, thorax and genitalia. Cells of the imaginal disks are set aside during embryogenesis and continue to grow and divide during the larval stages—unlike most other cells of the larva, which have differentiated to perform specialized functions and grow without further cell division. At metamorphosis, the larva forms a pupa, inside which the larval tissues are reabsorbed and the imaginal tissues undergo extensive morphogenetic movements to form adult structures. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 06 Oct 2013
- views: 17434
Developmental biology
Developmental biology is the study of the process by which animals and plants grow and develop, and is synonymous with ontogeny. In animals most development occurs in embryonic life, but it is also found in regeneration, asexual reproduction and metamorphosis, and in the growth and differentiation of stem cells in the adult organism. In plants, development occurs in embryos, during vegetative reproduction, and in the normal outgrowth of roots, shoots and flowers. Practical outcomes from the study of animal developmental biology have included in vitro fertilization, now widely used in fertility treatment, the understanding of risks from substances that can damage the fetus (teratogens), and the creation of various animal models for human disease which are useful in research. Developmental Biology has also help to generate modern stem cell biology which promises a number of important practical benefits for human health.
Perspectives
This page contains text from Wikipedia, the Free Encyclopedia -
http://wn.com/Developmental_biology
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
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29:51Online Developmental Biology: Overview of the Field
Online Developmental Biology: Overview of the FieldOnline Developmental Biology: Overview of the Field
Unit 1, Lecture 1: "Little Man". History of the field, current concepts, and future video lecture content -
42:49Developmental biology part 1 : introduction and grey crescent formation
Developmental biology part 1 : introduction and grey crescent formationDevelopmental biology part 1 : introduction and grey crescent formation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18] Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19] Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. Link- http://en.wikipedia.org/wiki/Main_Page -
41:40Developmental biology part 2 : clevage of zygote, polarity and differentiation
Developmental biology part 2 : clevage of zygote, polarity and differentiationDevelopmental biology part 2 : clevage of zygote, polarity and differentiation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18] Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19] Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. Link- http://en.wikipedia.org/wiki/Main_Page -
24:21Developmental biology part 3 : Gastrulation
Developmental biology part 3 : GastrulationDevelopmental biology part 3 : Gastrulation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2] Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tissues that will later form the nervous system. The mesoderm is found between the ectoderm and the endoderm and gives rise to somites, which form muscle; the cartilage of the ribs and vertebrae; the dermis, the notochord, blood and blood vessels, bone, and connective tissue. The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas.[4] Following gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.[2][5] The molecular mechanism and timing of gastrulation is different in different organisms. However, some common features of gastrulation across triploblastic organisms include: (1) A change in the topological structure of the embryo, from a simply connected surface (sphere-like), to a non-simply connected surface (torus-like); (2) the differentiation of cells into one of three types (endodermal, mesodermal, and ectodermal); and (3) the digestive function of a large number of endodermal cells.[6] Lewis Wolpert, pioneering developmental biologist in the field, has been credited for noting that "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life." The terms "gastrula" and "gastrulation" were coined by Ernst Haeckel, in his 1872 work "Biology of Calcareous Sponges".[7] Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation: 1) invagination 2) involution 3) ingression 4) delamination 5) epiboly.[8] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. Link- http://en.wikipedia.org/wiki/Main_Page -
27:49Online Developmental Biology: Introduction to Drosophila
Online Developmental Biology: Introduction to DrosophilaOnline Developmental Biology: Introduction to Drosophila
Unit 1, Lecture 3: How the Maggot Gets Its Stripes. Overview of the model organism Drosophila melanogaster -
132:11Developmental biology lecture | embryo development
Developmental biology lecture | embryo developmentDevelopmental biology lecture | embryo development
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertilization, morula, blastula and gastrula in step by step. It also explains the neurulation in frog and chick embryo. it explains the morphogenesis pattern in drosophila development. For more information, log on to- http://www.shomusbiology.com/ Get Shomu's Biology DVD set here- http://www.shomusbiology.com/dvd-store/ Download the study materials here- http://shomusbiology.com/bio-materials.html Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology- Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store Shomu’s Biology assignment services – www.shomusbiology.com/assignment -help Join Online coaching for CSIR NET exam – www.shomusbiology.com/net-coaching We are social. Find us on different sites here- Our Website – www.shomusbiology.com Facebook page- https://www.facebook.com/ShomusBiology/ Twitter - https://twitter.com/shomusbiology SlideShare- www.slideshare.net/shomusbiology Google plus- https://plus.google.com/113648584982732129198 LinkedIn - https://www.linkedin.com/in/suman-bhattacharjee-2a051661 Youtube- https://www.youtube.com/user/TheFunsuman Thank you for watching -
26:06Online Developmental Biology: Introduction to C. elegans
Online Developmental Biology: Introduction to C. elegansOnline Developmental Biology: Introduction to C. elegans
Unit 1, Lecture 4: Sydney's Choice. Overview of the model organism Caenorhabditis elegans -
12:20Early embryogenesis - Cleavage, blastulation, gastrulation, and neurulation
Early embryogenesis - Cleavage, blastulation, gastrulation, and neurulationEarly embryogenesis - Cleavage, blastulation, gastrulation, and neurulation
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. -
25:21Developmental biology part 5, developmental biology of drosophila
Developmental biology part 5, developmental biology of drosophilaDevelopmental biology part 5, developmental biology of drosophila
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html During oogenesis, cytoplasmic bridges called "ring canals" connect the forming oocyte to nurse cells. Nutrients and developmental control molecules move from the nurse cells into the oocyte. In the figure to the left, the forming oocyte can be seen to be covered by follicular support cells. After fertilization of the oocyte the early embryo (or syncytial embryo) undergoes rapid DNA replication and 13 nuclear divisions until approximately 5000 to 6000 nuclei accumulate in the unseparated cytoplasm of the embryo. By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nuclei, which will become the yolk nuclei). After the 10th division the pole cells form at the posterior end of the embryo, segregating the germ line from the syncytium. Finally, after the 13th division cell membranes slowly invaginate, dividing the syncytium into individual somatic cells. Once this process is completed gastrulation starts.[23] Nuclear division in the early Drosophila embryo happens so quickly there are no proper checkpoints so mistakes may be made in division of the DNA. To get around this problem, the nuclei that have made a mistake detach from their centrosomes and fall into the centre of the embryo (yolk sac), which will not form part of the fly. The gene network (transcriptional and protein interactions) governing the early development of the fruit fly embryo is one of the best understood gene networks to date, especially the patterning along the antero-posterior (AP) and dorso-ventral (DV) axes (See under morphogenesis).[23] The embryo undergoes well-characterized morphogenetic movements during gastrulation and early development, including germ-band extension, formation of several furrows, ventral invagination of the mesoderm, posterior and anterior invagination of endoderm (gut), as well as extensive body segmentation until finally hatching from the surrounding cuticle into a 1st-instar larva. During larval development, tissues known as imaginal discs grow inside the larva. Imaginal discs develop to form most structures of the adult body, such as the head, legs, wings, thorax and genitalia. Cells of the imaginal disks are set aside during embryogenesis and continue to grow and divide during the larval stages—unlike most other cells of the larva, which have differentiated to perform specialized functions and grow without further cell division. At metamorphosis, the larva forms a pupa, inside which the larval tissues are reabsorbed and the imaginal tissues undergo extensive morphogenetic movements to form adult structures. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. Link- http://en.wikipedia.org/wiki/Main_Page -
11:45Evolutionary Developmental Biology - Arkhat Abzhanov
Evolutionary Developmental Biology - Arkhat Abzhanov
-
Online Developmental Biology: Overview of the Field
Unit 1, Lecture 1: "Little Man". History of the field, current concepts, and future video lecture content -
Developmental biology part 1 : introduction and grey crescent formation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will ... -
Developmental biology part 2 : clevage of zygote, polarity and differentiation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will ... -
Developmental biology part 3 : Gastrulation
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2] Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tiss... -
Online Developmental Biology: Introduction to Drosophila
Unit 1, Lecture 3: How the Maggot Gets Its Stripes. Overview of the model organism Drosophila melanogaster -
Developmental biology lecture | embryo development
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertilization, morula, blastula and gastrula in step by step. It also explains the neurulation in frog and chick embryo. it explains the morphogenesis pattern in drosophila development. For more information, log on to- http://www.shomusbiology.com/ Get Shomu's Biology DVD set here- http://www.shomusbiology.com/dvd-store/ Download the study materials here- http://shomusbiology.com/bio-materials.html Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Pl... -
Online Developmental Biology: Introduction to C. elegans
Unit 1, Lecture 4: Sydney's Choice. Overview of the model organism Caenorhabditis elegans -
Early embryogenesis - Cleavage, blastulation, gastrulation, and neurulation
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. -
Developmental biology part 5, developmental biology of drosophila
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html During oogenesis, cytoplasmic bridges called "ring canals" connect the forming oocyte to nurse cells. Nutrients and developmental control molecules move from the nurse cells into the oocyte. In the figure to the left, the forming oocyte can be seen to be covered by follicular support cells. After fertilization of the oocyte the early embryo (or syncytial embryo) undergoes rapid DNA replication and 13 nuclear divisions until approximately 5000 to 6000 nuclei accumulate in the unseparated cytoplasm of the embryo. By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nucle... -
Online Developmental Biology: Overview of the Field
- Order: Reorder
- Duration: 29:51
- Updated: 11 Mar 2013
- views: 13705
Unit 1, Lecture 1: "Little Man".
History of the field, current concepts, and future video lecture content
Unit 1, Lecture 1: "Little Man".
History of the field, current concepts, and future video lecture content
wn.com/Online Developmental Biology Overview Of The Field
Unit 1, Lecture 1: "Little Man".
History of the field, current concepts, and future video lecture content
- published: 11 Mar 2013
- views: 13705
Developmental biology part 1 : introduction and grey crescent formation
- Order: Reorder
- Duration: 42:49
- Updated: 23 Sep 2013
- views: 27833
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Embryoge...
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Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
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Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 27833
Developmental biology part 2 : clevage of zygote, polarity and differentiation
- Order: Reorder
- Duration: 41:40
- Updated: 23 Sep 2013
- views: 16619
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Embryoge...
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Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
wn.com/Developmental Biology Part 2 Clevage Of Zygote, Polarity And Differentiation
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Embryogenesis is the step in the life cycle after fertilisation -- the development of the embryo, starting from the zygote (fertilised egg). Organisms can differ drastically in how the embryo develops, especially when they belong to different phyla. For example, embryonal development in placental mammals starts with cleavage of the zygote into eight uncommited cells, which then form a ball (morula). The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs (the bridge between these two parts eventually forms the umbilical cord). In contrast, the fruit fly zygote first forms a sausage-shaped syncytium, which is still one cell but with many cell nuclei.[18]
Patterning is important for determining which cells develop into which organs. This is mediated by signaling between adjacent cells by proteins on their surfaces, and by gradients of signaling secreted molecules.[19] An example is retinoic acid, which forms a gradient in the head to tail direction in animals. Retinoic acid enters cells and activates Hox genes in a concentration-dependent manner -- Hox genes differ in how much retinoic acid they require for activation and will thus show differential rostral expression boundaries, in a colinear fashion with their genomic order. As Hox genes code for transcription factors, this causes different activated combinations of both Hox and other genes in discrete anteroposterior transverse segments of the neural tube (neuromeres) and related patterns in surrounding tissues, such as branchial arches, lateral mesoderm, neural crest, skin and endoderm, in the head to tail direction.[20] This is important for e.g. the segmentation of the spine in vertebrates.[19]
Embryonic development does not always proceed correctly, and errors can result in birth defects or miscarriage. Often the reason is genetic (mutation or chromosome abnormality), but there can be environmental influence (like teratogens) or stochastic events.[21][22] Abnormal development caused by mutation is also of evolutionary interest as it provides a mechanism for changes in body plan (see evolutionary developmental biology).[2 Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 16619
Developmental biology part 3 : Gastrulation
- Order: Reorder
- Duration: 24:21
- Updated: 23 Sep 2013
- views: 34931
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Gastrula...
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Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2]
Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tissues that will later form the nervous system. The mesoderm is found between the ectoderm and the endoderm and gives rise to somites, which form muscle; the cartilage of the ribs and vertebrae; the dermis, the notochord, blood and blood vessels, bone, and connective tissue. The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas.[4] Following gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.[2][5]
The molecular mechanism and timing of gastrulation is different in different organisms. However, some common features of gastrulation across triploblastic organisms include: (1) A change in the topological structure of the embryo, from a simply connected surface (sphere-like), to a non-simply connected surface (torus-like); (2) the differentiation of cells into one of three types (endodermal, mesodermal, and ectodermal); and (3) the digestive function of a large number of endodermal cells.[6]
Lewis Wolpert, pioneering developmental biologist in the field, has been credited for noting that "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life."
The terms "gastrula" and "gastrulation" were coined by Ernst Haeckel, in his 1872 work "Biology of Calcareous Sponges".[7]
Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation: 1) invagination 2) involution 3) ingression 4) delamination 5) epiboly.[8] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
wn.com/Developmental Biology Part 3 Gastrulation
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Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ("three-layered") structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.[1][2]
Gastrulation takes place after cleavage and the formation of the blastula and primitive streak. Gastrulation is followed by organogenesis, when individual organs develop within the newly formed germ layers.[3] Each layer gives rise to specific tissues and organs in the developing embryo. The ectoderm gives rise to epidermis, and to the neural crest and other tissues that will later form the nervous system. The mesoderm is found between the ectoderm and the endoderm and gives rise to somites, which form muscle; the cartilage of the ribs and vertebrae; the dermis, the notochord, blood and blood vessels, bone, and connective tissue. The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas.[4] Following gastrulation, cells in the body are either organized into sheets of connected cells (as in epithelia), or as a mesh of isolated cells, such as mesenchyme.[2][5]
The molecular mechanism and timing of gastrulation is different in different organisms. However, some common features of gastrulation across triploblastic organisms include: (1) A change in the topological structure of the embryo, from a simply connected surface (sphere-like), to a non-simply connected surface (torus-like); (2) the differentiation of cells into one of three types (endodermal, mesodermal, and ectodermal); and (3) the digestive function of a large number of endodermal cells.[6]
Lewis Wolpert, pioneering developmental biologist in the field, has been credited for noting that "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life."
The terms "gastrula" and "gastrulation" were coined by Ernst Haeckel, in his 1872 work "Biology of Calcareous Sponges".[7]
Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation: 1) invagination 2) involution 3) ingression 4) delamination 5) epiboly.[8] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 23 Sep 2013
- views: 34931
Online Developmental Biology: Introduction to Drosophila
- Order: Reorder
- Duration: 27:49
- Updated: 20 Dec 2013
- views: 39917
Unit 1, Lecture 3: How the Maggot Gets Its Stripes.
Overview of the model organism Drosophila melanogaster
Unit 1, Lecture 3: How the Maggot Gets Its Stripes.
Overview of the model organism Drosophila melanogaster
wn.com/Online Developmental Biology Introduction To Drosophila
Unit 1, Lecture 3: How the Maggot Gets Its Stripes.
Overview of the model organism Drosophila melanogaster
- published: 20 Dec 2013
- views: 39917
Developmental biology lecture | embryo development
- Order: Reorder
- Duration: 132:11
- Updated: 01 Aug 2015
- views: 5909
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertiliza...
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertilization, morula, blastula and gastrula in step by step. It also explains the neurulation in frog and chick embryo. it explains the morphogenesis pattern in drosophila development.
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wn.com/Developmental Biology Lecture | Embryo Development
Embryo development - This developmental biology lecture explains different stages of embryonic development in details. It includes the explanation for fertilization, morula, blastula and gastrula in step by step. It also explains the neurulation in frog and chick embryo. it explains the morphogenesis pattern in drosophila development.
For more information, log on to-
http://www.shomusbiology.com/
Get Shomu's Biology DVD set here-
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http://shomusbiology.com/bio-materials.html
Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology-
Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store
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Thank you for watching
- published: 01 Aug 2015
- views: 5909
Online Developmental Biology: Introduction to C. elegans
- Order: Reorder
- Duration: 26:06
- Updated: 21 Feb 2014
- views: 25652
Unit 1, Lecture 4: Sydney's Choice.
Overview of the model organism Caenorhabditis elegans
- published: 21 Feb 2014
- views: 25652
Early embryogenesis - Cleavage, blastulation, gastrulation, and neurulation
- Order: Reorder
- Duration: 12:20
- Updated: 24 Oct 2014
- views: 249325
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT re...
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content.
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.
wn.com/Early Embryogenesis Cleavage, Blastulation, Gastrulation, And Neurulation
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content.
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.
- published: 24 Oct 2014
- views: 249325
Developmental biology part 5, developmental biology of drosophila
- Order: Reorder
- Duration: 25:21
- Updated: 06 Oct 2013
- views: 17434
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During o...
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During oogenesis, cytoplasmic bridges called "ring canals" connect the forming oocyte to nurse cells. Nutrients and developmental control molecules move from the nurse cells into the oocyte. In the figure to the left, the forming oocyte can be seen to be covered by follicular support cells.
After fertilization of the oocyte the early embryo (or syncytial embryo) undergoes rapid DNA replication and 13 nuclear divisions until approximately 5000 to 6000 nuclei accumulate in the unseparated cytoplasm of the embryo. By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nuclei, which will become the yolk nuclei). After the 10th division the pole cells form at the posterior end of the embryo, segregating the germ line from the syncytium. Finally, after the 13th division cell membranes slowly invaginate, dividing the syncytium into individual somatic cells. Once this process is completed gastrulation starts.[23]
Nuclear division in the early Drosophila embryo happens so quickly there are no proper checkpoints so mistakes may be made in division of the DNA. To get around this problem, the nuclei that have made a mistake detach from their centrosomes and fall into the centre of the embryo (yolk sac), which will not form part of the fly.
The gene network (transcriptional and protein interactions) governing the early development of the fruit fly embryo is one of the best understood gene networks to date, especially the patterning along the antero-posterior (AP) and dorso-ventral (DV) axes (See under morphogenesis).[23]
The embryo undergoes well-characterized morphogenetic movements during gastrulation and early development, including germ-band extension, formation of several furrows, ventral invagination of the mesoderm, posterior and anterior invagination of endoderm (gut), as well as extensive body segmentation until finally hatching from the surrounding cuticle into a 1st-instar larva.
During larval development, tissues known as imaginal discs grow inside the larva. Imaginal discs develop to form most structures of the adult body, such as the head, legs, wings, thorax and genitalia. Cells of the imaginal disks are set aside during embryogenesis and continue to grow and divide during the larval stages—unlike most other cells of the larva, which have differentiated to perform specialized functions and grow without further cell division. At metamorphosis, the larva forms a pupa, inside which the larval tissues are reabsorbed and the imaginal tissues undergo extensive morphogenetic movements to form adult structures. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
wn.com/Developmental Biology Part 5, Developmental Biology Of Drosophila
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During oogenesis, cytoplasmic bridges called "ring canals" connect the forming oocyte to nurse cells. Nutrients and developmental control molecules move from the nurse cells into the oocyte. In the figure to the left, the forming oocyte can be seen to be covered by follicular support cells.
After fertilization of the oocyte the early embryo (or syncytial embryo) undergoes rapid DNA replication and 13 nuclear divisions until approximately 5000 to 6000 nuclei accumulate in the unseparated cytoplasm of the embryo. By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nuclei, which will become the yolk nuclei). After the 10th division the pole cells form at the posterior end of the embryo, segregating the germ line from the syncytium. Finally, after the 13th division cell membranes slowly invaginate, dividing the syncytium into individual somatic cells. Once this process is completed gastrulation starts.[23]
Nuclear division in the early Drosophila embryo happens so quickly there are no proper checkpoints so mistakes may be made in division of the DNA. To get around this problem, the nuclei that have made a mistake detach from their centrosomes and fall into the centre of the embryo (yolk sac), which will not form part of the fly.
The gene network (transcriptional and protein interactions) governing the early development of the fruit fly embryo is one of the best understood gene networks to date, especially the patterning along the antero-posterior (AP) and dorso-ventral (DV) axes (See under morphogenesis).[23]
The embryo undergoes well-characterized morphogenetic movements during gastrulation and early development, including germ-band extension, formation of several furrows, ventral invagination of the mesoderm, posterior and anterior invagination of endoderm (gut), as well as extensive body segmentation until finally hatching from the surrounding cuticle into a 1st-instar larva.
During larval development, tissues known as imaginal discs grow inside the larva. Imaginal discs develop to form most structures of the adult body, such as the head, legs, wings, thorax and genitalia. Cells of the imaginal disks are set aside during embryogenesis and continue to grow and divide during the larval stages—unlike most other cells of the larva, which have differentiated to perform specialized functions and grow without further cell division. At metamorphosis, the larva forms a pupa, inside which the larval tissues are reabsorbed and the imaginal tissues undergo extensive morphogenetic movements to form adult structures. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
- published: 06 Oct 2013
- views: 17434
Evolutionary Developmental Biology - Arkhat Abzhanov
- Order: Reorder
- Duration: 11:45
- Updated: 23 Jan 2014
- views: 1153
Source - http://serious-science.org/videos/425
Harvard Associate Prof. Arkhat Abzhanov on studying barnacles, the first evo-devo research, and three germ layer...
Source - http://serious-science.org/videos/425
Harvard Associate Prof. Arkhat Abzhanov on studying barnacles, the first evo-devo research, and three germ layers
wn.com/Evolutionary Developmental Biology Arkhat Abzhanov
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Origination of Organismal Form Beyond the Gene in Developmental and Evolutionary Biology Vienna Seri
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A Photographic Atlas of Developmental Biology PDF
Download This Book : http://downloadbook.cinemaflix.co/?book=0895826291 A Photographic Atlas of Developmental Biology, by Shirley J. Wright is designed for all students taking courses in developmental biology, embryology, animal development and other similarly themed courses. This full-color atlas can be used in conjunction with any textbook or laboratory manual. 3-hole drilled.... -
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Bones and Cartilage Developmental and Evolutionary Skeletal Biology
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- Duration: 1:17
- Updated: 22 Jul 2016
- views: 0
- published: 22 Jul 2016
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Origination of Organismal Form Beyond the Gene in Developmental and Evolutionary Biology Vienna Seri
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Dictionary of Developmental Biology and Embryology
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A Photographic Atlas of Developmental Biology PDF
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A Photographic Atlas of Developmental Biology, by Shirley J. Wright is designed for al...
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A Photographic Atlas of Developmental Biology, by Shirley J. Wright is designed for all students taking courses in developmental biology, embryology, animal development and other similarly themed courses. This full-color atlas can be used in conjunction with any textbook or laboratory manual. 3-hole drilled....
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A Photographic Atlas of Developmental Biology, by Shirley J. Wright is designed for all students taking courses in developmental biology, embryology, animal development and other similarly themed courses. This full-color atlas can be used in conjunction with any textbook or laboratory manual. 3-hole drilled....
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Embryo CD Color Atlas for Developmental Biology CD ROM for Windows & Macintosh
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Essential Zebrafish Methods Cell and Developmental Biology Reliable Lab Solutions
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Experimental Embryology of the Mouse Monographs in Developmental Biology, Vol 19
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Bones and Cartilage, Second Edition Developmental and Evolutionary Skeletal Biology
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Genetic and Biochemical Aspects of the Development of Datura Monographs in Developmental Biology, Vo
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DNA expert Sean Carroll: "Evolutionary Developmental Biology"
Watch video of DNA expert Sean Carroll delivering the final lecture in the 2006-2007 Chancellor's Lecture Series, "Evolutionary Developmental Biology." Carroll helped develop the science of "evo devo" - or evolutionary developmental biology - which examines the relationships between embryonic development and evolutionary changes. -
Developmental biology part 7, spermatogenesis and oogenesis in mamals
For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Spermatogenesis is the process by which spermatozoa are produced from male primordial germ cells through mitosis and meiosis. The initial cells in this pathway are called spermatogonia, which yield primary spermatocytes by mitosis. The primary spermatocyte divides meiotically into two secondary spermatocytes; each secondary spermatocyte then completes meiosis as it divides into two spermatids. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes by their subdivision produce four spermatozoa.[1] Spermatozoa a...
DNA expert Sean Carroll: "Evolutionary Developmental Biology"
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Watch video of DNA expert Sean Carroll delivering the final lecture in the 2006-2007 Chancellor's Lecture Series, "Evolutionary Developmental Biology."
Carro...
Watch video of DNA expert Sean Carroll delivering the final lecture in the 2006-2007 Chancellor's Lecture Series, "Evolutionary Developmental Biology."
Carroll helped develop the science of "evo devo" - or evolutionary developmental biology - which examines the relationships between embryonic development and evolutionary changes.
wn.com/Dna Expert Sean Carroll Evolutionary Developmental Biology
Watch video of DNA expert Sean Carroll delivering the final lecture in the 2006-2007 Chancellor's Lecture Series, "Evolutionary Developmental Biology."
Carroll helped develop the science of "evo devo" - or evolutionary developmental biology - which examines the relationships between embryonic development and evolutionary changes.
- published: 17 Dec 2009
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Developmental biology part 7, spermatogenesis and oogenesis in mamals
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Spermatogenesis is the process by which spermatozoa are produced from male primordial germ cells through mitosis and meiosis. The initial cells in this pathway are called spermatogonia, which yield primary spermatocytes by mitosis. The primary spermatocyte divides meiotically into two secondary spermatocytes; each secondary spermatocyte then completes meiosis as it divides into two spermatids. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes by their subdivision produce four spermatozoa.[1]
Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis. In mammals it occurs in the male testes and epididymis in a stepwise fashion. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction. DNA methylation and histone modification have been implicated in the regulation of this process.[2] It starts at puberty and usually continues uninterrupted until death, although a slight decrease can be discerned in the quantity of produced sperm with increase in age (see Male infertility).
Oogenesis, ovogenesis or oögenesis /ˌoʊ.əˈdʒɛnɨsɪs/[1] is the creation of an ovum (egg cell). It is the female form of gametogenesis; the male equivalent is spermatogenesis. It involves the development of the various stages of the immature ovum.
In mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary.
Note that this process, important to all animal life cycles yet unlike all other instances of cell division, occurs completely without the aid of oo spindle-coordinating centrosomes.[2][3]
Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis, and finally maturation to form an ovum (oogenesis proper). Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
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Spermatogenesis is the process by which spermatozoa are produced from male primordial germ cells through mitosis and meiosis. The initial cells in this pathway are called spermatogonia, which yield primary spermatocytes by mitosis. The primary spermatocyte divides meiotically into two secondary spermatocytes; each secondary spermatocyte then completes meiosis as it divides into two spermatids. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes by their subdivision produce four spermatozoa.[1]
Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis. In mammals it occurs in the male testes and epididymis in a stepwise fashion. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction. DNA methylation and histone modification have been implicated in the regulation of this process.[2] It starts at puberty and usually continues uninterrupted until death, although a slight decrease can be discerned in the quantity of produced sperm with increase in age (see Male infertility).
Oogenesis, ovogenesis or oögenesis /ˌoʊ.əˈdʒɛnɨsɪs/[1] is the creation of an ovum (egg cell). It is the female form of gametogenesis; the male equivalent is spermatogenesis. It involves the development of the various stages of the immature ovum.
In mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary.
Note that this process, important to all animal life cycles yet unlike all other instances of cell division, occurs completely without the aid of oo spindle-coordinating centrosomes.[2][3]
Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis, and finally maturation to form an ovum (oogenesis proper). Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- http://en.wikipedia.org/wiki/Main_Page
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Online Developmental Biology: Overview of the Field
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Developmental biology part 1 : introduction and grey crescent formation
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Developmental biology part 2 : clevage of zygote, polarity and differentiation
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Online Developmental Biology: Introduction to Drosophila
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Developmental biology lecture | embryo development
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Online Developmental Biology: Introduction to C. elegans
Unit 1, Lecture 4: Sydney's Choice.
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Early embryogenesis - Cleavage, blastulation, gastrulation, and neurulation
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Evolutionary Developmental Biology - Arkhat Abzhanov
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Bones and Cartilage Developmental and Evolutionary Skeletal Biology
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Origination of Organismal Form Beyond the Gene in Developmental and Evolutionary Biology Vienna Seri
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Dictionary of Developmental Biology and Embryology
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A Photographic Atlas of Developmental Biology PDF
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Embryo CD Color Atlas for Developmental Biology CD ROM for Windows & Macintosh
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Essential Zebrafish Methods Cell and Developmental Biology Reliable Lab Solutions
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Experimental Embryology of the Mouse Monographs in Developmental Biology, Vol 19
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Bones and Cartilage, Second Edition Developmental and Evolutionary Skeletal Biology
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Genetic and Biochemical Aspects of the Development of Datura Monographs in Developmental Biology, Vo
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DNA expert Sean Carroll: "Evolutionary Developmental Biology"
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DNA expert Sean Carroll: "Evolutionary Developmental Biology"
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Developmental biology part 7, spermatogenesis and oogenesis in mamals
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Organs destroyed, 14-year-old raped Dalit girl dies in Delhi hospital
Edit Deccan Chronicle 25 Jul 2016
New Delhi ... “How many Nirbhayas does Delhi want? We all simply wait for next Nirbhaya to die,” the Delhi Commission for Women (DCW) Chairperson Swati Maliwal said on Twitter, adding she “never felt so helpless.” ... “With parents of 14-year-old victim ... ....
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Florida shooting: Two dead, 14 injured in gun attack on nightclub
Edit The Irish Times 25 Jul 2016
Local TV stations reported that the Club Blu club had been hosting a teen party at the time ... More to follow ... . ....
photo: AP / Jens Meyer
Man blows himself up at music festival in Germany, 12 injured
Edit The Malta Independent 25 Jul 2016
A man who blew himself up and injured 12 people after being turned away from an open-air music festival was a 27-year-old Syrian who had been denied asylum, Bavaria's top security official said early Monday. "We don't know if this man planned on suicide or if he had the intention of killing others," Bavarian interior minister Joachim Herrmann said ... Three of the 12 victims suffered serious injuries, Herrmann said ... ....
photo: AP / Liang Xu
China unveils 'world's largest seaplane'
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Hong Kong (CNN)China has completed what it describes as the world's largest seaplane. The amphibious AG600 is about the size of a Boeing 737 and will be used to fight forest fires and perform marine rescue operations, state-run news agency Xinhua said ... Military expansion. JUST WATCHED. China unveils huge military plane. Replay ... ....
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Known Knowns, Known Unknowns And Many Unknown Unknowns at DNC
Edit WorldNews.com 25 Jul 2016
Secretary of State Hillary Clinton, causing even Donald Trump to tweet. “Bernie did all that work for nothing.”There were also known unknowns, things that we knew we didn’t know but could still assume. In fact, many knew Clinton had to pick a white male to counter Donald Trump and woo male voters ... To know how, where or even when to look for them can in effect be an impossible task.For example, in picking Virginia Sen....
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Rice postdoc wins Branco Weiss Fellowship (Rice University)
Edit Public Technologies 25 Jul 2016
He joined Warmflash's Laboratory of Systems Stem Cell and Developmental Biology at Rice in 2015 ... 'He is now poised to attack long-standing questions in developmental biology with these systems, and this award recognizes the promise of that research as well as Idse's really strong accomplishments in theoretical biology in the past.' ... Laboratory of Systems Stem Cell and Developmental Biology (Warmflash Lab)....
DNA technique heralds future advances in disease detection
Edit China Daily 25 Jul 2016
Their technique, called LcnPCR, developed during more than 10 years of research at the Institute of Biochemistry and Cell Biology, a branch of the Shanghai Institutes for Biological Sciences at the Chinese Academy of Sciences. It has been included in Methods in Molecular Biology, a textbook "for everybody in the molecular biology field around the world", said Wang Xuecai, deputy director of the institute ... ....
Intrexon Introduces Florian™ Switch Technology for Flowering Control (Intrexon Corporation)
Edit Public Technologies 25 Jul 2016
XON), a leader in the engineering and industrialization of biology to improve the quality of life and health of the planet, today introduced its Florian™ technology, an 'on-off' regulation switch enabling a variety of commercial applications in agriculture ... Control of flowering using Florian™ technology represents an elegant biological approach to helping farmers grow more with less waste....
NEET-2 - Students find biology, chemistry papers tougher than last year
Edit The Times of India 25 Jul 2016
Students appearing for the National Eligibility cum Entrance Test (NEET 2) exam found biology and chemistry papers tougher than it came in NEET -1 on Sunday ... Arsal Naqvi, a resident of Kidwai Nagar, found the biology section toughest, said, "Six questions were from biotech topic which were relatively more difficult than in previous year."....
NEET-2 questions turn out to be bitter pill for aspiring medicos
Edit The Times of India 25 Jul 2016
Indore ... "Overall the paper was tough in comparison to NEET-1 ... Zoology had more weightage in biology paper ... He said that candidates, who will score 70 to 80 marks in physics, 80 to 90 in chemistry and 270 to 280 in biology sections, will be able to manage a place in the merit list ... The three-hour test had 180 questions of physics, chemistry and biology. Physics and chemistry had 45 questions each, while biology section had 90 ... RELATED....
Biological Indicator Market Status, Manufactures, Production Supply, Sales, Demand and Forecasts to 2020
Edit PR Newswire 25 Jul 2016
PUNE, India, July 25, 2016 /PRNewswire/ -- The 2016 Global Biological Indicator Market Research Report is about the current state of the worldwide biological indicators in detail with a focus on future projections of this market and an emphasis on the areas of development, key regional... ....
Gujarat girl wins gold at 27th International Biology Olympiad
Edit The Times of India 25 Jul 2016
VADODARA. A Surat girl has brought laurels to the country by winning a gold medal at the 27th International Biology Olympiad (IBO) held at Hanoii in Vietnam ... All participant countries send their top students, who are winners of their respective National Biology Olympiad ... Shah has been involved with the biology Olympiad movement in India since 2011 and this was the third occasion in which he was part of the Indian team ... RELATED....
NEET-II physics, chemistry papers tough, say students
Edit DNA India 25 Jul 2016
--> Mon, 25 Jul 2016-06.24am , dna. CBSE successfully conducts exams across 739 centres in 56 cities ... Most of the candidates found the physics and chemistry papers challenging, while biology, they felt, was better. The examination was held at 739 centres in 56 cities ... NEET was also held peacefully at Srinagar (J&K) and 93% candidates took the exam there ... While the biology paper was better ... On other hand, biology was better." ... ....
Gerald Green takes long road back to Boston Celtics
Edit Worcester Telegram 25 Jul 2016
... Celtics chose him out of the strip-mall high school Gulf Shores Academy in Florida — a basketball lifetime that has included eight NBA cities, stops in Russia and China, and repeated journeys to the Developmental League — the 30-year-old Green has reportedly agreed to a one-year contract to return to the franchise that once rolled ......
USAID Gems Donates 7 Laptop Computers to NBC
Edit All Africa 25 Jul 2016
[LINA] The Deputy Director General of the National Bureau of Concessions (NBC) has described USAID GEMS Liberia as a true partner that delivers on developmental capacity especially when the need arises ... ....
Geingob to Set Tone On Foreign Policy
Edit All Africa 25 Jul 2016
[New Era] Windhoek -President Hage Geingob is expected this morning to set the tone on the country's foreign policy - which is perceived as vague - as he shifts his attention to diplomacy after mapping out his domestic developmental direction ... ....
Wnt signalling shown to play critical role in hair follicle stem cell maintenance (A*STAR - Agency For Science, Technology And Research)
Edit Public Technologies 25 Jul 2016
Singapore - Scientists from A*STAR's Institute of Medical Biology (IMB) and Stanford University have found strong evidence that Wnt signalling is a crucial component in the maintenance of hair follicle stem cells (HFSCs), challenging long-held beliefs about HFSC maintenance and growth ... About A*STAR's Institute of Medical Biology (IMB)....
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