If a man who is colour blind marries a woman | vedclass

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(C) Colour blindness is an $X$-linked recessive disorder. Let the genotype of the colour blind man be $X^CY$ and the normal woman be $XX$.The cross be

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(C) Colour blindness is an $X$-linked recessive disorder. Let the genotype of the colour blind man be $X^CY$ and the normal woman be $XX$.The cross between them is as follows:$X^CY 	imes XX ightarrow X^CX, X^CX, XY, XY$.The offspring produced are two carrier daughters $(X^CX)$ and two normal sons $(XY)$.Since the sons receive their $X$ chromosome from their mother and $Y$ chromosome from their father,and the mother is normal $(XX)$,all sons will be normal.Therefore,the probability of their sons having colour blindness is $0 \%$.

If a man who is colour blind marries a woman who is pure normal for colour vision,the chances of their sons having colour blindness is

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