kengr

This wasn't a case of AIS, though, as people with AIS have (often undescended) testes rather than ovaries, and no uterus. This is a very unusual case, since almost all XY females lack ovaries, and frequently lack a uterus as well. In fact, when I first read about XY females, years ago, it was said that it was XY females were invariably infertile. Obviously that's not completely true!

XO doesn't normally result in a typical female phenotype, however. XO females are generally infertile and usually have significant health problems, and lowered IQ. XO is embryonic lethal in something like 90-95% of cases, that is, 90-95% of XO zygotes will fail to reach full term.