question_answer

A normal woman whose father was colourblind, is married to a normal man. The sons would be

A) 75% colourblind                               

B) 50% colourblind                               

C)  all normal          

D)         all colourblind

Correct Answer: B

Solution :

The genotype of normal woman with colourblind father = XXh The genotype of normal man = XY Normal woman x Normal man \[\therefore \]50% of the sons would be colourblind.