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by adminu 2608 days ago
There actually are more combinations involving three chromosomes. They make binary classification quite... impossible
2 comments

Or people who have a Y chromosome yet lack the SRY gene, or lack a Y chromosome but have the SRY gene on another chromosome.

It's incredibly complicated and it's frankly amazing that sexual dimorphism and reproduction works even as well as it does.

There's also the possibility of being monosomal: X0