Why is the frequency of red-green colour blin | vedclass

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Question

(C) Red-green colour blindness is an $X$-linked recessive disorder.Females have two $X$ chromosomes $(XX)$,so for a female to be colourblind,both $X$

Vedclass · Accepted Answer

Males have only one $X$ chromosome,so a single recessive allele expresses the trait.

Vedclass · Answer

(C) Red-green colour blindness is an $X$-linked recessive disorder.Females have two $X$ chromosomes $(XX)$,so for a female to be colourblind,both $X$ chromosomes must carry the recessive allele $(X^cX^c)$.In contrast,males have only one $X$ chromosome $(XY)$. If an $X$ chromosome carries the recessive allele $(X^cY)$,the male will express the trait because there is no second $X$ chromosome to mask the effect of the recessive allele.Therefore,the probability of males being affected is significantly higher than that of females.

Why is the frequency of red-green colour blindness many times higher in males than in females?

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