"There's only XX and XY! Biology 101!"
Viable chromosome variations:
XXY: 1 in 500+ people
XYY: 1 in 1000 people
X: 1 in 2000+ people
XXXY: 1 in 18,000+ people
There are more than 7 billion humans on the planet and millions of them aren't XX or XY. Time for a new textbook.
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