Principles of Inheritance and Variation Question 212
212. A colour blind girl is rare because she will be born only when
[1991]
(a) her mother and maternal grand father were colour blind
(b) her father and maternal grand father were colour blind
(c) her mother is colour blind and father has normal vision
(d) parents have normal vision but grand parents were colour blind.
Show Answer
Answer : b
Hints & Solution
(b) The genotype of the mother has to be either $X^{C} X^{C}$ or $X^{C} X$ and that of father to be $X^{C} Y$ so that the daughter becomes colour blind.
