Question

A man whose father was colour blind marries a
woman who had a colour blind mother and normal
father. What percentage of male children of this
couple will be colour blind ? [AIPMT-2014)
(1) 25%
(2) 0%
(3) 50%
(4) 75%​

Answer 1

Answer:

Your answer is C.50%.

Explanation:

Because Colour blindness is the X-linked recessive disease. The genotype of male is XY and female is XX.But in this case,woman mother is colour blind.so,the woman is carrier of colour blindness in this place.Refer the above attachment. In the attachment the diagram shows one female carrier,colour blind male and normal male and female.In the above question they ask the Percentage of male child which was affected by color blindness.so, one child is normal and one child is colour blindness.

Hope it helps.