A boy is colour blind. Among his two sisters, | vedclass

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

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(C) Colour blindness is an $X$-linked recessive trait. Let $X^c$ be the allele for colour blindness and $X$ be the normal allele. The boy is colour blind,so his genotype is $X^c Y$. He receives his $Y$ chromosome from his father and his $X^c$ chromosome from his mother. Since one sister is colour blind $(X^c X^c)$,she must have received one $X^c$ from the mother and one $X^c$ from the father. This implies the father must be colour blind $(X^c Y)$ and the mother must be a carrier $(X^c X)$. Therefore,the mother is a carrier and the father is colour blind. Looking at the options,the mother is the one who carries the trait and passes it to the children,but the father is also affected. Given the context of the question,the mother's genotype is essential for the daughters to be colour blind.

$A$ boy is colour blind. Among his two sisters,one is colour blind and one is a carrier (normal). Who is colour blind in his family?

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