- published: 21 May 2015
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Sexual reproduction is a form of reproduction where two morphologically distinct types of specialized reproductive cells called gametes fuse together, involving a female's large ovum (or egg) and a male's smaller sperm. Each gamete contains half the number of chromosomes of normal cells. They are created by a specialized type of cell division, which only occurs in eukaryotic cells, known as meiosis. The two gametes fuse during fertilization to produce DNA replication and the creation of a single-celled zygote which includes genetic material from both gametes. In a process called genetic recombination, genetic material (DNA) joins up so that homologous chromosome sequences are aligned with each other, and this is followed by exchange of genetic information. Two rounds of cell division then produce four daughter cells with half the number of chromosomes from each original parent cell, and the same number of chromosomes as both parents, though self-fertilization can occur. For instance, in human reproduction each human cell contains 46 chromosomes, 23 pairs, except gamete cells, which only contain 23 chromosomes, so the child will have 23 chromosomes from each parent genetically recombined into 23 pairs. Cell division initiates the development of a new individual organism in multicellular organisms, including animals and plants, for the vast majority of whom this is the primary method of reproduction. A species is defined as a taxonomic rank. A species is often defined as the largest group of organisms where two hybrids are capable of reproducing fertile offspring, typically using sexual reproduction, although the species problem encompasses a series of difficult related questions that often come up when biologists define the word species.
The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants, with about 350,000 species. Like gymnosperms, angiosperms are seed-producing plants; they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure, in other words, a fruiting plant. The term "angiosperm" comes from the Greek composite word (angeion-, "case" or "casing", and sperma, "seed") meaning "enclosed seeds", after the enclosed condition of the seeds.
The ancestors of flowering plants diverged from gymnosperms in the Triassic Period, during the range 245 to 202 million years ago (mya), and the first flowering plants are known from 160 mya. They diversified extensively during the Lower Cretaceous, became widespread by 120 mya, and replaced conifers as the dominant trees during 100 to 60 mya.
Made for the Wonder of Living series for Australian school children. 3D animation and production by Aarons CGI - http://www.aaronscgi.net
Worksheet: https://docs.google.com/file/d/0Bx3dvd-kesbET3JpMGw3d1lOWEk/edit?usp=sharing Learn that most animals go through sexual reproduction. Sperm is the male reproductive cell and the egg is the female reproductive cell. Fertilization is the joining of reproductive cells. Some animal have internal fertilization and some are external. Sexual reproduction creates unique offspring with traits from both parents.
Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.
You will learn about "Sexual Reproduction in Flowering Plants" in this video. Let us learn about the male and female reproductive parts of flowering plants. Stamen is the male reproductive part of the flower. It consists of the anther and the filament. The anther produces pollen grains. Each matured pollen grain contains a tube cell consisting of a tube nucleus and two male gametes. Carpel is the female reproductive part of the flower. Top part of the carpel is called the stigma. Stigma is supported by the style. Base part of the carpel is the ovary. Ovary contains one or more ovules. Each ovule has a female gamete. There are some flowers that contain either stamen or carpel. They are called unisexual flowers. For fertilization to take place, pollen grains need to be transferred from the s...
For more information: http://www.7activestudio.com info@7activestudio.com http://www.7activemedical.com/ info@7activemedical.com http://www.sciencetuts.com/ 7activestudio@gmail.com Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. Sexual reproduction is a form of reproduction ...
Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work? Crash Course Biology is now available on DVD! http://dft.ba/-8bCC Like CrashCourse: http://www.facebook.com/YouTubeCrashCourse Follow CrashCourse: http://www.twitter.com/TheCrashCourse Table of Contents 1) Gametes: Ova and Sperm 2:27 2) Sex Determination 4:59 3) Secondary Sexual Characteristics 6:48 4) Female Reproductive Structures 7:25 a) Uterus & Oviducts 7:40 b) Endometrium (Menstruation) 7:57 c) Cervix & Vagina 8:32 5) Male Reproductive Structures 8:45 a) Scrotum, Sminferous Tubules & Epididymas 8:59 b) Penis 9:37 c) Vas Deferens to Eurethra (Emission) 10:13 References h...
This video is geared towards middle school science students. It goes over the basics of asexual and sexual reproduction and discusses a few state exam questions.
Made for the Wonder of Living series for Australian school children. 3D animation and production by Aarons CGI - http://www.aaronscgi.net
Worksheet: https://docs.google.com/file/d/0Bx3dvd-kesbET3JpMGw3d1lOWEk/edit?usp=sharing Learn that most animals go through sexual reproduction. Sperm is the male reproductive cell and the egg is the female reproductive cell. Fertilization is the joining of reproductive cells. Some animal have internal fertilization and some are external. Sexual reproduction creates unique offspring with traits from both parents.
Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.
You will learn about "Sexual Reproduction in Flowering Plants" in this video. Let us learn about the male and female reproductive parts of flowering plants. Stamen is the male reproductive part of the flower. It consists of the anther and the filament. The anther produces pollen grains. Each matured pollen grain contains a tube cell consisting of a tube nucleus and two male gametes. Carpel is the female reproductive part of the flower. Top part of the carpel is called the stigma. Stigma is supported by the style. Base part of the carpel is the ovary. Ovary contains one or more ovules. Each ovule has a female gamete. There are some flowers that contain either stamen or carpel. They are called unisexual flowers. For fertilization to take place, pollen grains need to be transferred from the s...
For more information: http://www.7activestudio.com info@7activestudio.com http://www.7activemedical.com/ info@7activemedical.com http://www.sciencetuts.com/ 7activestudio@gmail.com Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. Sexual reproduction is a form of reproduction ...
Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work? Crash Course Biology is now available on DVD! http://dft.ba/-8bCC Like CrashCourse: http://www.facebook.com/YouTubeCrashCourse Follow CrashCourse: http://www.twitter.com/TheCrashCourse Table of Contents 1) Gametes: Ova and Sperm 2:27 2) Sex Determination 4:59 3) Secondary Sexual Characteristics 6:48 4) Female Reproductive Structures 7:25 a) Uterus & Oviducts 7:40 b) Endometrium (Menstruation) 7:57 c) Cervix & Vagina 8:32 5) Male Reproductive Structures 8:45 a) Scrotum, Sminferous Tubules & Epididymas 8:59 b) Penis 9:37 c) Vas Deferens to Eurethra (Emission) 10:13 References h...
This video is geared towards middle school science students. It goes over the basics of asexual and sexual reproduction and discusses a few state exam questions.