question_answer

A normal- visioned man whose father was colourblind, marries a woman whose father was also colourblind. They have their first child as a daughter. What are the chances that this child would be colourblind?

A) 100%               

B) 0%    

C) 25%                 

D) 50%

Correct Answer: B

Solution :

[b] Colour blindness is an X-linked disease. So, a woman whose father is colourblind will be a carrier for the disease. So, the possibility of a colourblind daughter (i.e. X-0) in Fi-generation is 0%.