NEET Biology question

The colour blindness is more likely to occur in males than in females because

(A)The Y-chromosome of males carries the genes for distinguishing colours
(B)The gene for colour vision is located on the X-chromosomeCorrect
(C)The trait is dominant in males and recessive in females
(D)None of the above

Answer: (B)

Solution

The gene for colour vision (and its defective, colour-blind allele) is carried on the X-chromosome. Since males are hemizygous (XY, only one X), a single recessive allele is sufficient to produce colour blindness; females (XX) need two copies () to be affected, making them far more often only carriers.

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Question ID VK-120171