Supposedly the only major difference between male and female brains is size/volume but I noticed that all trannies without exception have speech and behavior typical of their original gender. I noticed it in early transitioners too so the argument that it's based on socialization doesn't hold. Even if you are trans, your "firmware" seems to correspond to your biological sex despite how you were raised, your hormones levels etc.
This leads me to the question: how is this behavior encoded and passed between generations? Does your DNA say, for example, "this group of neurons will make predisposed to nagging" or something along those lines?