A daughter becomes colorblind only when: | vedclass

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Question

(A) Colorblindness is an $X$-linked recessive disorder. For a daughter to be colorblind,she must inherit the recessive allele $(X^c)$ from both parent

Vedclass · Accepted Answer

Father is colorblind,mother is a carrier.

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(A) Colorblindness is an $X$-linked recessive disorder. For a daughter to be colorblind,she must inherit the recessive allele $(X^c)$ from both parents. This means her genotype must be $X^cX^c$. $1$. The father must be colorblind $(X^cY)$,so he contributes an $X^c$ chromosome to his daughter. $2$. The mother must be either a carrier $(X^cX)$ or colorblind $(X^cX^c)$ to contribute an $X^c$ chromosome. Among the given options,if the father is colorblind $(X^cY)$ and the mother is a carrier $(X^cX)$,there is a $25\%$ chance of having a colorblind daughter $(X^cX^c)$. Option $A$ is the most appropriate condition where the father is colorblind and the mother is a carrier,ensuring the daughter receives the recessive allele from both.

$A$ daughter becomes colorblind only when:

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