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

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(A) The genotype of a colour-blind man is $X^c Y$,where $X^c$ represents the $X$-linked recessive allele for colour blindness.The genotype of a woman

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$0$

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(A) The genotype of a colour-blind man is $X^c Y$,where $X^c$ represents the $X$-linked recessive allele for colour blindness.The genotype of a woman homozygous for normal colour vision is $XX$.When these parents produce offspring,the possible genotypes are:- Daughters: $X^c X$ (carriers with normal vision)- Sons: $XY$ (normal vision)Since the son receives his $Y$ chromosome from the father and his $X$ chromosome from the mother (who is homozygous normal),all sons will have normal vision.Therefore,the probability of their son being colour-blind is $0$.

If a colour-blind man marries a woman who is homozygous for normal colour vision,the probability of their son being colour-blind is

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