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Isn't colorblindness almost exclusively found in males too?
Probably oversimplifying, but it's something about the mutation being on the X chromosome, meaning women have a backup X and men don't.
It is possible for someone with two X chromosomes to still be colorblind, but since this gene is recessice you have to have the mutation on both chromosomes, which makes it way more rare.
You pretty much nailed it
It’s not really a backup X. In any given cell in a woman’s body, one of the X chromosomes has been inactivated into something called a Barr body. The remaining X chromosome is then the active one.
Women carriers of the gene defect for protan (causing protanopia in males) exhibit Schmidt’s Sign, an abnormal insensitivity to long wavelengths (red light). This is due to the highly skewed L:M cone ratio caused by the defective gene.
I know a colorblind XX person. But he's a trans man, so make of that what you will.