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?
-
100%
-
0%
-
25%
-
50%
Solution
B.
0%
Colour blindness is a X-linked disease. So, woman whose father was colourblind will be carrier for the disease.
So, possibility of a colourblind daughter (i.e., XcXc in F1 generation is 0%.)
