Question

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. 1
B. 0
C. 0.25
D. 0.5

Answer 1

Correct Answer - B
Colour blindness is an X-linked disease. So, woman whose father was colour blind will be carrier for the disease.

So, possibility of a colour blind daughter (i.e., `X^(c ) X^(c )` in `F_(1)`-generation is 0%).