Hormones are the thing that defines development, more or less. There’s lots of things that effect hormones, and everyone has verying degrees of testosterone and estrogen, and other hormones. Chromosomes are associated with hormones, but do not totally define what hormones are in the body when and where. That’s even ignoring the fact we can control what hormones are in the body now manually, which directly changes how the body develops.
Hormones are the thing that defines development, more or less. There’s lots of things that effect hormones, and everyone has verying degrees of testosterone and estrogen, and other hormones. Chromosomes are associated with hormones, but do not totally define what hormones are in the body when and where. That’s even ignoring the fact we can control what hormones are in the body now manually, which directly changes how the body develops.