And that's exactly why this X will get the red lowercase C because the person is color blind, and the Y doesn't actually get anything because the Y chromosome doesn't actually contain that particular gene. Okay, so now we know what the layout is. Now we know what the genotypes of these individuals are. Let's actually carry out the mating process. So when these mates, before they actually mate, each one of these produce sex cells. The heterozygous normal female produces two types of egg cells.