Then you should have no problem with answering the question I asked of you in my previous post.
There is a biological definition of sex, but not gender. So your previous question regarding a biological definition of gender is fallacious. Yet again, if you want to understand gender identity, you have to understand the biological basis of sex determination and how that varies.
I think the point that @melanie.'s was making is that your only contribution to this board so far has had little to do with SCUBA.