Principles of Inheritance and Variation Question 113
113. Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is
[1990]
(a) $0 \%$
(b) $25 \%$
(c) $50 \%$
(d) $75 \%$
Show Answer
Answer : a
Hints & Solution
(a) The probability of the daughter becoming colour blind arises only when the father is also colour blind.
Husband - XY
Wife $-XX^{C}$ (wife is carrier
because her father is colour blind)
So, probability of their daughter becoming colour blind is $0 \%$.
