Principles of Inheritance and Variation Question 54
54. 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
[2005]
(a) may be colour blind or may be of normal vision
(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
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Answer : a
Hints & Solution
(a) Since the woman’s father was colour blind, she would be a carrier of the colour blindness gene. When she marries a colour blind man, their progeny could be
