All this talk about Y chromosomes just shows a massive lack of knowledge of how genetics works. First of all, the Y chromosome does not contain the recipe for the penis, that's found elsewhere. The Y chromosome codes for a few random things, but primarily just acts as something other genes check for before they're expressed. "Is Y present? If Yes, you're male. Go."
Secondly, Komodo dragons don't use XY, they use ZW. With ZW being female, and ZZ being male. This is the opposite of humans where XX is female, XY is male.
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