Okay, so we all know that women have XX chromosomes, and men have XY sex genes. Occassionally something will go wrong, and people will be born who are XXY or XXX. These are facts.
At the moment, I'm writing a fanfiction for Naruto, the anime. It's all purely fiction, and as such, certain liberties are being taken. There's a comparatively small subgenre of fanfiction called 'mpreg', where one of the male characters, usually a male in a gay relationship, somehow falls pregnant. In my story it's made possible through the consumption of a special medicine. It's more magic than science, but being a scientist myself, I can't help but think about some of the possible consequences of a male x male pregnancy.
For example, in such a situation it would be possible for a YY baby to be conceived. There'd be a 25% chance of such an occurence with each conception. I would really like to hear your thoughts on how such a baby might develop, what sort of deformities it might have, whether or not such a foetus could even survive to term, or if it would more likely miscarry early on.
Please humor my curiosity. It is, after all, the mark of a scientist.