The Y-chromosome through which men become degraded, and after 4.5 million years could disappear completely. This was stated by the British geneticist Darren Griffin of the University of Kent, adding that this term by the standards of evolution can be called quite small.
As told Griffin in the article on the website sciencealert.com, the Y chromosome contains the SRY gene, which plays a key role in the development of male sexual characteristics. The specialist said that the rest of today, many of the genes located in Y chromosome, does not represent something necessary for human survival, according to experts that this is logical, given that women are without it “cost”, while unique to the female sex chromosome exists.
According to the author, the degradation of the male chromosome can be traced back to ancient times — the first mammals 166 million years ago, it was the same size as the X chromosome, but later the situation changed. The researcher obyasnyat in the first place, the fact that it is passed exclusively from father to son and, consequently, not involved in the process of recombination — the “mixing” of genes, which is a main advantage of the method of sexual reproduction over asexual.
According to the scientist, the disappearance of the Y-chromosome does not necessarily imply that the Earth will not remain of the men themselves — as suggested by Griffin, the SRY gene in this scenario can move to a different chromosome, and then passed solely through the male line will become it.
At the same time, the expert notes that in a much closer future than 4.5 million years of genetic engineering can make men much less “necessary” than it is today, providing the ability to create babies from two women. However, the scientist seems extremely unlikely that even with the advent of this innovation, people will completely abandon the “natural” reproduction.
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