I just named multiple ones for you, what in the hell are you talking about. What I’m refusing to do is put an upper limit on it, because there is a lot going on biologically with sex.
y is a chromosome not a gene
My point exactly.
You literally aren’t even following this conversation. The SRY gene controls testicle and penis development. It is not the Y chromosome. It is usually found on the Y chromosome, but can be on the X chromosome as well. Someone with an XX genotype and an SRY gene will develop a penis and testes, and may go on to father children. Read the Wikipedia article I linked if you need more explanation. You want to tell me someone who was born male and produces sperm is biologically female because of their chromosomes??