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Is The Human Male Going Extinct? by Nobody: 4:42pm On Feb 25, 2012 |
Men are doomed? Not quite, says gene study Feb 24, 2012, 07.00AM IST AFP Theories that men will eventually become extinct because the Y chromosome which determines maleness is shrinking are quite wrong, according to a gene study published on Wednesday. The men-are-doomed scenario leapt to prominence nearly a decade ago when scientists found that the male chromosome had dramatically shrivelled. It had plummeted from a super-Y of more than 1,400 genes several hundred million years ago to a nubby little stump with just several dozen. That discovery triggered opinion that the Y was on the skids. We humans could end up like the Transcaucasian mole vole, according to one worrying thought. A mammal whose Y chromosome has been routed by evolutionary pressure, the mole vole has differentiated into two species, one of which is Y-less. How the gender of its offspring is determined is a mystery. In the worst scenario, men would disappear without some artificial means to keep the beleaguered gender going. Some doomsayers said this would happen in around five million years as the Y chromosome went the way of the dodo. But the latest study says the Y's shrinkage occurred in the very distant past and the chromosome has been wonderfully stable for millions of years. The new evidence comes from a comparison of the human Y chromosome with that of the rhesus macaque - a so-called Old World monkey whose evolutionary path diverged from humans and chimps some 25 million years ago. _ www.timesofindia.com/home/science/Men-are-doomed-Not-quite-says-gene-study/articleshow/12013865.cms |
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