A colour-blind son will be born when: | vedclass

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(B) Colour blindness is an $X$-linked recessive disorder. Let $X^c$ represent the allele for colour blindness and $X$ represent the normal allele.If t

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Mother is colour-blind and father is normal

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(B) Colour blindness is an $X$-linked recessive disorder. Let $X^c$ represent the allele for colour blindness and $X$ represent the normal allele.If the mother is colour-blind $(X^c X^c)$ and the father is normal $(XY)$,the cross is $X^c X^c 	imes XY$.The possible offspring are $X^c X$ (carrier daughter) and $X^c Y$ (colour-blind son).Therefore,all sons born to a colour-blind mother will be colour-blind,regardless of the father's phenotype.

$A$ colour-blind son will be born when:

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