All sons of a couple are colourblind because

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(A) Colour blindness is an $X$-linked recessive disorder.For a son to be colourblind,he must inherit the $X$ chromosome carrying the recessive allele

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Mother is homozygous colourblind

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(A) Colour blindness is an $X$-linked recessive disorder.For a son to be colourblind,he must inherit the $X$ chromosome carrying the recessive allele from his mother.If the mother is homozygous colourblind $(X^cX^c)$,she will pass the $X^c$ chromosome to all her sons.Since sons receive their only $X$ chromosome from their mother and the $Y$ chromosome from their father,all sons will be colourblind $(X^cY)$ regardless of the father's genotype.

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