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(C) Color blindness is an $X$-linked recessive trait.Let $X^C$ be the allele for color blindness and $X$ be the normal allele.The genotype of the colo

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(C) Color blindness is an $X$-linked recessive trait.Let $X^C$ be the allele for color blindness and $X$ be the normal allele.The genotype of the colorblind man is $X^C Y$.The genotype of the woman with normal vision is $X X$.When they cross: $X^C Y 	imes X X ightarrow X^C X, X^C X, XY, XY$.The offspring are: two carrier daughters $(X^C X)$ and two normal sons $(XY)$.Since the sons receive the $Y$ chromosome from the father and the $X$ chromosome from the mother,and the mother is normal $(XX)$,all sons will have normal vision.Therefore,the probability of their son being colorblind is $0$.

If a colorblind man marries a woman with normal vision,what is the probability of their son being colorblind?

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