CHAT

Friday, 27 September 2019

Y chromosome

The Y chromosome is one of two sex chromosomes (allosomes) in mammals, including humans, and many other animals. The other is the X chromosome. Y is the sex-determining chromosome in many species, since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers testis development. The DNA in the human Y chromosome is composed of about 59 million base pairs. The Y chromosome is passed only from father to son. With a 30% difference between humans and chimpanzees, the Y chromosome is one of the fastest evolving parts of the human genome. To date, over 200 Y-linked genes have been identified. All Y-linked genes are expressed and (apart from duplicated genes) hemizygous (present on only one chromosome) except in the cases of aneuploidy such as XYY syndrome or XXYY syndrome. (See Y linkage.)

Overview

Discovery

The Y chromosome was identified as a sex-determining chromosome by Nettie Stevens at Bryn Mawr College in 1905 during a study of the mealworm Tenebrio molitor. Edmund Beecher Wilson independently discovered the same mechanisms the same year. Stevens proposed that chromosomes always existed in pairs and that the Y chromosome was the pair of the X chromosome discovered in 1890 by Hermann Henking. She realized that the previous idea of Clarence Erwin McClung, that the X chromosome determines sex, was wrong and that sex determination is, in fact, due to the presence or absence of the Y chromosome. Stevens named the chromosome "Y" simply to follow on from Henking's "X" alphabetically.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Y_chromosome

Latest News for: y-dna

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Illumina, maker of DNA sequencing machines, had a small round of layoffs in September

CNBC 27 Sep 2019

In its last earnings call, Illumina noted that it was impacted by weaknesses in the direct-to-consumer market, as sales of genetic tests from companies like 23andMe and Ancestry were down ... ....

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Telenor reports ownership of nearly 95 percent of Finnish telco, DNA; begins process to form ...

Nasdaq Globe Newswire 27 Sep 2019

(Fornebu, 27 September 2019) After completing the initial mandatory tender offer (MTO) period for shares in Finnish telco, DNA, Telenor Group today reports a preliminary holding of 94.36 percent of DNA shares and will extend the MTO offer period until 10 October 2019 ... ....

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Sheriff: DNA tests ID mother of baby girl found dead in 1994

Corvallis Gazette-Times 27 Sep 2019

(AP) — Louisiana authorities say DNA testing has helped them identify and arrest the mother of a baby girl found dead in a trash can 25 years ago ... baby's DNA matched that of a relative in a national database. He says DNA testing ultimately confirmed Charles was the baby's mother....

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DNA left at Thomaston scene tips police to suspect in string of burglaries

Republican American 27 Sep 2019

TORRINGTON – It wasn’t a smashed cash register police found when they answered a burglar alarm at 3.50 a.m. on Dec. 1, 2017 at the Citgo gas station in Thomaston. It was $3,438 worth of Newport cigarettes ... The accused thieves left behind […] LOG IN REQUIRED ... LOG IN ... ....

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DNA Edit: Crucial amendment - Empowerment of rape victims is much-needed

DNA India 27 Sep 2019

In March this year, the Bombay High Court was witness to a bizarre spectacle ... Significantly, attitudes and the law are changing ... Hopefully, it will pave the way for change in other courts as well and strikes a blow in favour of women empowerment.  Bombay High Court Delhi High Court rape case dna edit opinion Rape Victim . ....

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DNA Edit: Pak warmongering - Hardliners are baying for war and India needs to be alert

DNA India 27 Sep 2019

India’s intelligence and security agencies are in the orange alert mode ... Pakistan Narendra Modi Pervez Musharraf Jaish-e-Mohammed (JeM) Amit Shah Imran Khan terrorists dna edit opinion Amarinder Singh Article 370 Security Threat Ajit Doval Pakistani Army Bipin Rawat Abrogation of Article 370. ....

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Researchers developing new 'DNA stitch' to treat muscular dystrophy

Science Daily 26 Sep 2019

A new therapeutic being tested is showing early promise as a more effective treatment that could help nearly half of patients with Duchenne muscular dystrophy (DMD). The treatment -- a cocktail of DNA-like molecules -- results in dramatic regrowth of a protein called dystrophin, which acts as a support beam to keep muscles strong ... ....

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‘Rapid DNA’ promises breakthroughs in solving crimes. So why does it face a backlash?

Richmond Times Dispatch 26 Sep 2019

For decades, scientists have used ever-improving DNA forensics to help solve crimes and detect suspects in cold cases such as the Golden State Killer. But it has never been quick work. Laboratory analyses of genetic evidence can take weeks, even .......

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Unlocking the life-saving secrets of African DNA

Gwinnett Daily Post 26 Sep 2019

In 2006, US scientists published a landmark study that linked lower levels of a gene known as PCSK9 to lower rates of heart disease ... ....

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'Rapid DNA' promises breakthroughs in solving crimes. So why does it face a backlash?

Taunton Daily Gazette 26 Sep 2019

For decades, scientists have used ever-improving DNA forensics to help solve crimes and detect suspects in cold cases such as the Golden State Killer ... DNA."The printer-sized boxes -- costing up to $250,000 apiece -- can analyze a sample of blood, saliva or other biological ......

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DNA test of child leads to rape charges against former Pa. man

Penn Live 26 Sep 2019

Investigators say DNA tests of a child helped lead to rape and related charges against a former Bethlehem man ... Investigators collected DNA from the woman, the child and Frey ... Follow her on Twitter @SarahCassi ... ....

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DNA match leads to arrest of long-haul truck driver, 69, suspected of raping at least ...

The Daily Mail 26 Sep 2019

Police in Clearfield, Utah, police say 69-year-old Mark Douglas Burns was arrested on Wednesday after a years-long investigation using familial matching DNA samples in collaboration with a true-crime TV show ... According to the statement, the agency investigated multiple rapes in Clearfield between 1994 and 2001, and collected DNA evidence....

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DNA Edit: Don’t kill cricket - The game is losing appeal in its current Mecca, India

DNA India 26 Sep 2019

India’s number one sport could be in trouble, because like most things commercial, it is risky to take it for granted ... Opinion is divided ... There is a method to this madness ... Cricket is India’s lifeline and should continue to be so.  Cricket IPL World Cup South Africa BCCI West Indies dna edit opinion Twenty20 KPL TNPL . ....