[spockz]

> > In the last 190 million years, the number of genes on the Y has plummeted from more than 1,000 to roughly 50, a loss of more than 95 percent.

How much of this has happened in the recent human history? Are we becoming less “manly”?

[im3w1l]

Not really. The y-chromosome started out as a tiny variation of the x-chromosome. So all those genes were duplicates of genes on the x-chromosome.