RichardKennaway comments on Open Thread, Jul. 13 - Jul. 19, 2015 - Less Wrong Discussion
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Woman is the biological default. That's why women have redundancy on the 23rd chromosomal pair, whereas men have a special "Y" chromosome - leading to much higher rates of genetic disorders in men. That's why in infant male humans, the testicles have to descend. And so on. Both from an encoding and from a developmental point of view, a man is a woman altered to be masculine. And testosterone is what does that altering.
Yes, it could have been different. We can imagine a species with a neutral default, which then gets altered to be either masculine or feminine by different sex-encoding hormones. But that's not how humans came about.
You could with equal sense (i.e. very little) summarise the same empirical observations as "a woman is an incompletely developed man."
No quite because 'development' at least suggests that the change happens 'later'.