NEET Biology question

More men suffer from colourblindness than women because

(A)Women are more resistant to disease than men
(B)The male sex hormone testosterone causes the disease
(C)The colourblind gene is carried on the 'Y' chromosome
(D)Men are hemizygous and one defective gene is enough to make them colourblindCorrect

Answer: (D)

Solution

The gene for colourblindness is located on the X chromosome. Since men are hemizygous for X-linked genes (having only a single X chromosome), a single copy of the recessive colourblindness allele is sufficient to produce the phenotype; women, having two X chromosomes, need both copies to be

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Question ID VK-119758