Principles Of Inheritance And Variation Ques 135
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 chances that this child would be colour blind?
(a) 100%
(b) zero percent
25%
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 carriers not the colourblind. 50% of sons would be colourblind.
BETA
