What? Do I have to spell this out for you, or do you not know simple genetic biology, gene frequencies and such?
Males have the X and Y chromosomes.
Females have two X chromosomes.
On one side of the square go X and Y.
On the other goes two Xs.
Therefore, if you actually cross (or whatever you want to call it) the chromosomes over, you get two sets of male (XY) chromosomes and two sets of female (XX) chromosomes.
If you can’t understand that, then explain why males are approximately 50% of the population? (I really hope you already know that from day-to-day experiences.)
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