Long story short, when teaching a bunch of 15 year olds biology, they dont go into every detail and exception at a university level.
You were also taught plants need sunlight to survive, yet there are plants that grow in the dark.
You were taught a lot of things that are true in 99% of the cases.
People somehow fail to understand that having a basic understanding of a subject also means you lack some deeper knowledge on the subject.
As for genetics and the XX/XY system.
It’s just a simplification of how things really work.
I’m no biologist.
I couldnt explain it better than that system
It’s a fine system for a large percentage of cases
But it’s not how it works all the time
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