Those are two real medical diagnoses - Swyer syndrome or XY gonadal dysgenesis for XY women (occurs in about 1:100000 women) and de la Chapelle syndrome or XX male syndrome for XX men (occurs in about 1:20000 to 1:30000 men)

Here is a NORD report on Swyer syndrome, as well as the original article on de la Chapelle syndrome: 1.https://rarediseases.org/rare-diseases/swyer-syndrome/ 2.https://pmc.ncbi.nlm.nih.gov/articles/PMC1762158/