""the chromosonal determinants that distinguish women from men remain fully in place"

And sometimes those chromosomes are *wrong* in relation to the actual gender of the person, just like other errors that can be common to biology"

Maybe it's society's definition of gender that is wrong.
I wish we had some ungendered personal pronouns. Why do we need to know a baby's sex before we can say "aaah isn't he/she/it lovely".
I don't wear high heels or warpaint, but that doesn't make me a male. I see myself as a person, not a woman. So I find it hard to understand how some people can be so attached to the characature of the opposite gender that they want to change - though I accept that some do.