in turner syndrome one x chromosome is absent, no y chromosome is present, therefore they are female. most affected women are infertile, i am not sure if they can produce viable ova. in swyer syndrome the sry gene fails to be activated, or another step in the male sex determination fails. this causes them to be infertile, their gonads are highly cancerous and do not contain functional germ cells, which means they cannot produce eggs or sex hormones. rspo1 and wnt4 are typically absent in 46,xy individuals. there have been some cases of pregnancy, as far as i am aware, all of them have utilized donor ova. so you see, males are not modified default females. just because your male differentiation fails on a genetic level, does not mean that female differentiation magically turns on. that is not how it works.
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