Jamablaya

8 science deniers so far.

As far as I know, intersex is caused most often by a double fertilized egg, or that thing that happens when one twin absorbs the other in utero, chimeraism or mosaic. Something similar causes Down syndrome, an extra chromosome gets in there somehow.

No, it really doesn't. All ethical arguments aside, veterinarians/doctors/scientists/animal breeders often sex-select sperm for breeding purposes, very common as far as animals, I assume common enough in assisted human pregnancies. Anyways, bio sex is literally determined by the male input, not the female, it is quite literally decided at conception even if you can't see it yet. (Why I know this? Farmer. You have no idea how violent and dangerous Holstein bulls are. Even before selected sex sperm was an option, dairy farmers went with artificial insemination rather than risking getting killed by one of those bastards. Most people, even farmers, have not seen an intact, full grown, Holstein bull. Jersey are the same way, but not quite as bad. For whatever reason, beef breed bulls, dangerous as they are, are much calmer than dairy breed). Ever met one of those guys with like 7 daughters? It's quite often not a coincidence, think back to history class and medieval rulers getting divorced because their wife wouldn't produce a male heir, and then the new wife wouldn't either, nor the next wife, and the doctor who said something like "Maybe it's you, your Majesty" was executed.