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(A) Colour blindness is a recessive sex-linked trait caused by a gene on the $X$ chromosome.Let $X^c$ represent the allele for colour blindness and $X

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all colour blind

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(A) Colour blindness is a recessive sex-linked trait caused by a gene on the $X$ chromosome.Let $X^c$ represent the allele for colour blindness and $X$ represent the normal allele.$A$ colour blind woman has the genotype $X^c X^c$.$A$ normal visioned man has the genotype $XY$.When they reproduce,the cross is $X^c X^c 	imes XY$.The possible genotypes for the offspring are $X^c X$ (carrier daughters) and $X^c Y$ (colour blind sons).Since all sons receive their $X$ chromosome from their mother,and the mother is colour blind $(X^c X^c)$,all sons will inherit the $X^c$ allele.Therefore,all sons will be colour blind.

If a colour blind woman marries a normal visioned man,their sons will be

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