Re: Does ? have a Y chromosome ?
X/Y, male/female is not the binary choice you think it is. As with EVERYTHING you were taught as a child, it's just not true, genetically, mentally, or even in the heads of others.
There are numerous "intersex" conditions, there are many (sometimes conflicting) genetic markers, and no one marker is enough to determine a binary answer. Hell, when it comes to sportswomen in the pre-Olympics news, it's almost impossible to say that they were 100% born a woman or a man, for example.
You were taught biology by the age-old precept of "lies to children". In the same way that Pluto isn't a planet, chameleons don't change colour, Newton wasn't hit by an apple (but close!), brontosaurus never were, most bee species don't gather honey or even live together and atoms are not "the smallest thing" by a long-shot, the X/Y chromosome thing is, although correlated, not definitive on the issue of gender. And we don't just mean you can be a little effeminate/masculine if other things are tweaked but that you can be the polar opposite of what gender your X/Y dictates and healthy and reproductive and "normal" (whatever that means in this context).
Hell, it's not unheard of (or even that rare) for humans to grow feathers or horns, so saying that someone's DNA will indisputably give you a binary "sex" is so wrong as to be ridiculous. And exactly the kind of prejudice that forces people to hide "secrets" like this - this is what makes people bring up their child to "be a man" when they have deformed genitalia and are actually female, and then people wonder why they rebel later and actually turn out to live a "homosexual" life (because it's not, to them, biologically speaking!). This is exactly the kind of thing that make some intersex / confused / deformed / not accepted children who would have lead a perfectly happy life were it not for other people to commit suicide and similar.
My girlfriend works as a genetic scientist and if you have a relative with cancer in the London area she's probably the one who did the labwork to determine whether it was cancer or not, along with a range of other genetic ailments. She will happily tell you that you can get perfectly everyday samples where it's actually almost impossible to tell the sex of the patient from the DNA alone, or that you can find female patients who have no history of gender reassignment who have certain parts of "male" DNA. It's a handy guideline and nothing more.
And drawing a line in the sand between male and female is no more ridiculous than drawing a line in the sand between good and evil. There are clearly people on both sides, and clearly people who should be in one category or the other at some time in their lives, but there's no way to definitively categorises people binarily without coming up against something that will really stretch your credibility to pigeonhole.