If a son is affected by hemophilia,from whom | vedclass

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(D) Hemophilia is an $X$-linked recessive disorder. Since a son receives his $Y$ chromosome from his father and his $X$ chromosome from his mother,the

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Carrier mother

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(D) Hemophilia is an $X$-linked recessive disorder. Since a son receives his $Y$ chromosome from his father and his $X$ chromosome from his mother,the gene for hemophilia must be present on the $X$ chromosome inherited from the mother. If the mother is a carrier $(X^HX^h)$,she can pass the $X^h$ chromosome to her son,resulting in a hemophilic son $(X^hY)$. Therefore,the probability of the son inheriting the disease comes from a carrier mother.

Column-$I$	Column-$II$
$(P)$ Haemophilia	$(i)$ Recessive gene: $X^{h}X^{h}$
$(Q)$ Colour blindness	$(ii)$ Recessive gene: $pp$
$(R)$ Phenylketonuria	$(iii)$ Recessive gene: $Hb^{s}Hb^{s}$
$(S)$ Sickle-cell anaemia	$(iv)$ Recessive gene: $X^{c}X^{c}$

If a son is affected by hemophilia,from whom is the probability of inheriting this disease?

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