Well, you can have XXY or XXX or XXYY or several other combinations, but it's the presence or absence of the Y chromosome that matters. Then there is XY46 DSD which is a birth defect where the genitals form incorrectly; it is often "treated" by raising the male child as a girl but requires hormones to do so. Then there's chimeras, but there's only a couple dozen sex discordant chimeras ever identified. So while the left will try to claim that it's super complicated and there's tons of exceptions to binary sex in reality you could fit all of the actual exceptions in a single waiting room.
Well, you can have XXY or XXX or XXYY or several other combinations, but it's the presence or absence of the Y chromosome that matters. Then there is XY46 DSD which is a birth defect where the genitals form incorrectly; it is often "treated" by raising the male child as a girl but requires hormones to do so. Then there's chimeras, but there's only a couple dozen sex discordant chimeras ever identified. So while the left will try to claim that it's super complicated and there's tons of exceptions to binary sex in reality you could fit all of the actual exceptions in a single waiting room.
Yep. You have the Punnet square and birth defects.
If the mutation prevents the individual from breeding, then it's an abnormal birth defect and not an evolutionary variant.
At least for the polysomy disorders breeding is typically possible although some of them may reduce fertility.