(A) Colour blindness is a sex-linked recessive disorder. It is caused by the presence of a recessive gene located on the $X$ chromosome. Since males h

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(A) Colour blindness is a sex-linked recessive disorder. It is caused by the presence of a recessive gene located on the $X$ chromosome. Since males have only one $X$ chromosome,they are more frequently affected than females,who require two copies of the recessive gene to express the trait.