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The sex chromosomes of mammals have actually developed over an incredible number of years, originating from two chromosomes that are identical.

The sex chromosomes of mammals have actually developed over an incredible number of years, originating from two chromosomes that are identical. Y Chromosome Is More Than a Sex Switch. The little, stumpy Y chromosome—possessed by male mammals but not females, and sometimes shrugged down as doing a bit more than determining the intercourse of the…
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