Throughout human history, relatively few men seem to have had a greater input into the gene pool than the rest, suggests a study of variations in DNA. Tens of thousands of years of polygamy has left a mark on our genomes that is a signature that small numbers of males must have mated with lots of females. Over time, such a pattern will spawn more genetic differences on the X chromosome than the Y chromosome – this is because women have two copies of the X, while men only one. (source: newscientist.com)
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