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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

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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

(1) must have normal colour vision

(2) may be colour blind or may be of normal vision

(3) will be partially colour blind since he is heterozygous for the colour blind mutant allele

(4) must be colour blind

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Correct answer: (2) may be colour blind or may be of normal vision

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