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(C) Color blindness is an $X$-linked recessive disorder.Let the normal vision allele be $X^C$ and the color-blindness allele be $X^c$.The son is color

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$X^C X^c$

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(C) Color blindness is an $X$-linked recessive disorder.Let the normal vision allele be $X^C$ and the color-blindness allele be $X^c$.The son is color-blind,so his genotype must be $X^c Y$.$A$ son inherits his $Y$ chromosome from his father and his $X$ chromosome from his mother.Therefore,the son must have inherited the $X^c$ chromosome from his mother.Since the mother has normal vision,she must possess at least one dominant $X^C$ allele.Thus,the mother's genotype must be $X^C X^c$ (a carrier).

$A$ woman with normal vision marries a man with normal vision and they have a color-blind son. What is the genotype of the mother?

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