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[–]FourteenDigitz 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

The extreme edge cases you’re looking for are linked to the SRY gene, which is normally attached to the Y chromosome and whose activation triggers the testosterone hormone wash that creates a male. The misfiring of the SRY gene can create XX males and XY females.

[–]Datachost 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

To my knowledge though XX males don't produce viable sperm, nor do XY females tend to have a uterus/ovaries. At least people with CAIS don't.