It was found that color blindness is due to the recessive allele (Xd), normal color sensation is due to the dominant allele (XD), therefore, women heterozygous for this gene (XDXd) had normal vision. Consider which children can be born to a woman who carries the gene for color blindness (ХDХd), who married a man with normal color sensation (ХDY). A woman will give half of her sons and daughters the X chromosome with the gene for color blindness (Xd), and half will give the X chromosome with the gene for normal color sensation (XD). At the same time, all daughters will receive a second X chromosome from the father with the gene for normal color perception (XD), so they will all have normal vision, but half of them will be carriers of the recessive color blind gene received from the mother (1XDXD: 1XDXd). All sons will receive the Y chromosome from their father, and half of them will be color blind (1XDY: 1XdY).
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