A woman with normal vision,but whose father w | vedclass

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(D) Colour blindness is an $X$-linked recessive trait.Let the allele for normal vision be $X^C$ and the allele for colour blindness be $X^c$.The woman

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May be colour blind or may be of normal vision.

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(D) Colour blindness is an $X$-linked recessive trait.Let the allele for normal vision be $X^C$ and the allele for colour blindness be $X^c$.The woman has normal vision but her father was colour blind,so her genotype is $X^CX^c$ (carrier).The man is colour blind,so his genotype is $X^cY$.When these two individuals marry,the cross is $X^CX^c 	imes X^cY$.The possible genotypes for their children are:$1$. $X^CX^c$ (Carrier daughter)$2$. $X^cX^c$ (Colour blind daughter)$3$. $X^CY$ (Normal vision son)$4$. $X^cY$ (Colour blind son)Since the question specifies the child is a boy,we look at the male offspring genotypes: $X^CY$ and $X^cY$.Therefore,the boy has a $50\%$ chance of being colour blind and a $50\%$ chance of having normal vision.

$A$ woman with normal vision,but whose father was colour blind,marries a colour blind man. Suppose that the fourth child of this couple is a boy. What is the probability of this boy being colour blind?

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