Colour blindness is caused by a single

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(C) Colour blindness is a sex-linked recessive disorder caused by a mutation in the genes on the $X$ chromosome.In males,there is only one $X$ chromos

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Recessive gene in man

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(C) Colour blindness is a sex-linked recessive disorder caused by a mutation in the genes on the $X$ chromosome.In males,there is only one $X$ chromosome $(XY)$. If this $X$ chromosome carries the recessive gene for colour blindness,the male will express the trait.In females,there are two $X$ chromosomes $(XX)$. For a female to be colour blind,she must inherit the recessive gene on both $X$ chromosomes $(X^cX^c)$.Therefore,a single recessive gene on the $X$ chromosome is sufficient to cause colour blindness in a man.

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