question_answer

What are all the chances of colour blind daughter and sons being born in a marriage of normal man marrying a normal woman, whose father was colour blind [Kerala CET  2003]

A) All sons are normal and all daughters are colourblind

B) Both the sons and daughters are colourblind

C) All the sons are colourblind and all daughters are normal

D) 50% sons are colourblind and all daughters are phenotypically normal

Correct Answer: D

Solution :

A woman whose father was colourblind is actually normal phenotypically but carrier of colourblindness if this woman marrying with normal man. Then