A normal woman,whose father was colour-blind, | vedclass

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(D) Colour blindness is an $X$-linked recessive trait.Since the woman's father was colour-blind,she must have inherited the recessive allele for colou

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$50\%$ colour-blind

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(D) Colour blindness is an $X$-linked recessive trait.Since the woman's father was colour-blind,she must have inherited the recessive allele for colour blindness from him. Thus,the woman is a carrier with the genotype $X^cX$.The normal man has the genotype $XY$.When they cross $(X^cX 	imes XY)$,the possible genotypes for their offspring are:$X^cX$ (Carrier daughter)$XX$ (Normal daughter)$X^cY$ (Colour-blind son)$XY$ (Normal son)Out of the two possible genotypes for sons ($X^cY$ and $XY$),one is colour-blind and one is normal.Therefore,$50\%$ of the sons would be colour-blind.

$A$ normal woman,whose father was colour-blind,is married to a normal man. The sons would be

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