Hey Eric, I meant no offense with my comment. I was not aware of the difference between the terms sex and gender. To me (as a German) they were perfect synonyms until now. So a person that’s male by birth buts feels closer to being a woman would be of male sex but female gender? Then yes, I was talking about sex.
I’m exclusively interested in whether a person has one or two X chromosomes and what makes them visually different. I hope this phrasing is better.