A man is a completely different matter, of course.
But scientists have now completely mapped the human Y chromosome. (Which also means we have sequenced all 24 chromosomes).
The Y chromosome proved to be really complicated. It's small, it's faster evolving, it's highly repetitive. This should allow us to identify genes involved in sperm production, which could help with male factor infertility.
The size varies tremendously between individuals, and this may tell us why some males are more fertile than others.
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