Principles of Inheritance and Variation Question 153
153. A normal- visioned man whose father was colour. blind, marries a woman whose father was also colour blind. They have their first child as a daughter. what are the chance that this child would be colour blind ?
(a) 100%
(b) zero percent
(c) 25%
(d) 50%
Show Answer
Answer : b
Hints & Solution
(b) If a normal visioned man marries a woman whose father was also colourblind, then his wife would be carrier of this disease if her mother was normal. This trait is passed into children but daughters produced by this couple are carrier not the colourblind. 50% of sons would be colourblind.
