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

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(B) Colour blindness is an $X$-linked recessive disorder.Let $X^c$ represent the allele for colour blindness and $X$ represent the allele for normal v

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(B) Colour blindness is an $X$-linked recessive disorder.Let $X^c$ represent the allele for colour blindness and $X$ represent the allele for normal vision.The genotype of the colour blind man is $X^cY$.The genotype of the homozygous normal vision woman is $XX$.When they cross: $X^cY 	imes XX$.The possible offspring genotypes are $XX^c$ (carrier daughter) and $XY$ (normal son).Since the son receives the $Y$ chromosome from the father and the $X$ 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 vision,the probability of their son being colour blind is ......... (in $\%$)

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