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Salemicus comments on Open Thread, Jul. 13 - Jul. 19, 2015 - Less Wrong Discussion
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Are the opposite? I assumed the XX/XY goes back to the very beginnings of gender i.e. fishes... how comes very different chromosomes can make the same hormones i.e. AFAIK birds do have testosterone?
Birds have a ZZ/ZW system where the male is the homogametic sex.
Yes, birds have testosterone. Mind you, women have testosterone. It's the elevated quantity of testosterone that leads to masculinity.