It takes a man to carry a Y chromosome, and it takes the Y chromosome to make sperm, which is necessary for human reproduction. So men are essential to the future of the species.
But researchers have found that, over the millennia, the Y chromosome has lost most of it genes. What if it were to disappear altogether? NPR's Joe Palca explores that possibility in the first report of a three-part series on the End of Men.
Source: National Public Radio January 14
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