Chromasomes? I thnk that no matter how one looks or sounds or acts everything about how some people gender poeople might just be a scale of masculin and femanin leading to a tipping of the scale in the direction of either XX or XY. And for some chromasomes are the difinition of male and female is decided by this subcontiously.
But for some chromasomes are not a desider and completelly irelavent and preffer to go by how the scale ends up, but the weight of each atribut is different for everybody, exanple I feel that transitioning doesn't make me more female, but I want it because I am? But for some I'm not a woman at all untill I do.
So those two are a what and a who? I know who I am is what's important, but to others its a what that is a colection of physical attributs? And visual and audible presentations?
I had a conversation with my seven year old nephew and tried to exsplain the situation, and even at a young age he showed an ability to think for himself, when I first started presenting as female full time he looked at me and said why you got girls clothes on? I said because I am a girl. So he looked puzzled but asked how? So I said your a boy arnt you? Yes he said, and that no matter how you look or act or like that you still you? Yes. And that you would still be you? And so he smiled and said so Inside you a girl but just look like a boy on the outside

The one thing he did that surprised me was ask how

his older brother just luaghed and said you still a boy. And his older sister was it doesn't matter what you are to me. And his younger sister 5 just wants to do make up with me and never once struggle with the name change or pronoun differences.
So even in the same house hold opinions can be exstreamly contrasting.