Mr. Stevan is suffering from haemophilia and | vedclass

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(C) Haemophilia is an $X$-linked recessive disorder,and cystic fibrosis is an autosomal recessive disorder.Mr. Stevan is suffering from both,so his ge

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$\frac{1}{2}$

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(C) Haemophilia is an $X$-linked recessive disorder,and cystic fibrosis is an autosomal recessive disorder.Mr. Stevan is suffering from both,so his genotype is $X^hY$ for haemophilia and $cc$ for cystic fibrosis.Since he is a male,his sperm cells will carry either the $X$ chromosome or the $Y$ chromosome.For the $X$-linked trait,the sperm will carry the recessive allele $X^h$ with a probability of $1$.For the autosomal trait,since he is $cc$,all his gametes will carry the recessive allele $c$ with a probability of $1$.Therefore,the probability of a sperm carrying both the recessive $X$-linked allele $(X^h)$ and the recessive autosomal allele $(c)$ is $1 	imes 1 = 1$. However,considering the segregation of chromosomes,the sperm carrying the $X^h$ allele is $1/2$ of the total sperm produced.Thus,the probability is $1/2$.

Mr. Stevan is suffering from haemophilia and cystic fibrosis. His father is heterozygous for cystic fibrosis. The probability of Stevan's sperm having recessive $X$-linked as well as autosomal allele is

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