More men suffer from colour blindness than wo | vedclass

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(D) men are hemizygous and one defective gene is enough to make them colour blind.More men suffer from colour blindness than women because men are hem

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men are hemizygous and one defective gene is enough to make them colour blind.

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(D) men are hemizygous and one defective gene is enough to make them colour blind.More men suffer from colour blindness than women because men are hemizygous for the $X$ chromosome. Since men have only one $X$ chromosome,a single recessive allele on this chromosome is sufficient to express the trait of colour blindness. In contrast,women have two $X$ chromosomes,so they require two defective copies of the gene to express the condition,making it significantly less common in women.

More men suffer from colour blindness than women because

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