A colour blind man marries a woman with norma | vedclass

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(B) colour blind man has the genotype $X^cY$,and a normal woman has the genotype $XX$.When they marry,the offspring are: $X^cX$ (carrier daughter) and

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$0.25$

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(B) colour blind man has the genotype $X^cY$,and a normal woman has the genotype $XX$.When they marry,the offspring are: $X^cX$ (carrier daughter) and $XY$ (normal son).All daughters are carriers $(X^cX)$ and all sons are normal $(XY)$.When a carrier daughter $(X^cX)$ marries a normal man $(XY)$,the possible genotypes for their children are: $XX$ (normal daughter),$X^cX$ (carrier daughter),$XY$ (normal son),and $X^cY$ (colour blind son).The probability of having a colour blind son (the grandson of the original couple) is $1/4$ or $0.25$.

$A$ colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?

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