The daughter born to a haemophilic father and | vedclass

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(B) Haemophilia is an $X$-linked recessive disorder.Let $X^H$ be the normal allele and $X^h$ be the haemophilic allele.The father is haemophilic,so hi

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(B) Haemophilia is an $X$-linked recessive disorder.Let $X^H$ be the normal allele and $X^h$ be the haemophilic allele.The father is haemophilic,so his genotype is $X^hY$.The mother is normal,so her genotype is $X^HX^H$ (assuming she is not a carrier).When these parents produce offspring,the father contributes his $Y$ chromosome to his daughters and his $X^h$ chromosome to his daughters.The mother contributes an $X^H$ chromosome to all her children.Therefore,the genotype of the daughter will be $X^HX^h$.Since the daughter has one normal allele $(X^H)$ and one haemophilic allele $(X^h)$,she will be a carrier of the disease.

The daughter born to a haemophilic father and a normal mother could be:

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