Relsqui comments on 2011 Less Wrong Census / Survey - Less Wrong
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Technically, isn't it the number of X chromosomes that matters to colorblindness? It's just that people with Y chromosomes almost always have one X chromosome, and people without them almost always have two.
You're correct; we asked for Y chromosomes rather than X chromosomes because it's way easier to have an extra X and not know it than to have a Y and not know it. So if we ask about Y, we can rough-sort into "probably XY" and "probably XX" groups and then look at the statistics for chromosomal deviations within those groups.