[wayoutthere]

Probably better to say "assigned male at birth" -- I'm not genetically male, but everyone assumed I was until I got tested after transitioning. The best medically relevant definitions are "person on testosterone", "person on estrogen" etc. There is a lot of suspicion that things like estrogen/androgen receptor binding affinity play a big role in gender identity and brain development, and we haven't even scratched the surface of that level of genetics.

There is no medically or legally significant difference between "gender" and "sex". You can get the sex/gender (different states use different terms interchangeably) on your drivers' license and birth certificate changed.