NEET Biology question

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy

(A)May be colour blind or may be of normal visionCorrect
(B)Must be colour blind
(C)Must have normal colour vision
(D)Will be partially colour blind since he is heterozygous for the colour blind mutant allele

Answer: (A)

Solution

Since the woman's father was colour blind, she must be a carrier, . Her husband is colour blind, . Crossing gives sons either (colour blind) or (normal vision), each with probability 1/2,

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Question ID VK-120162