Why do men have receding hairlines and pattern baldness, while women do not?
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Gender-pattern baldness / GPB is affected by many factors, including several different genes that are located nowhere near each other on our DNA.
It just so happens that one of the more significant genetic markers for this happens to be carried on the X-chromosome, specifically. This means that, since men tend to have only one X-chromosome while women tend to have two, women can have one X-chromosome “for” GPB, and their other X-chromosome “against” it. Men, with XY-genetics, only have the single X-chromosome (inherited specifically from their mother, incidentally — which leads to a lot of mother-to-son inheritance traits, including but not limited to GPB) so a man only has the single version of the gene whichever they got.
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