Question

What percentage of children are colour blind if their father is colour blind and the mother is a carrier for Colour blindness?

• (A) 25%
• (B) 50%
• (C) 75%
• (D) 100%

Answer 1

The Correct Option is B

Explanation:
The percentage of children who are colour blind if their father is colour blind and the mother is a carrier for colour blindness is 50% because the father will produce Xc and Y chromosomes and the mother will produce X^c and X chromosomes. Their children will have the genotypes- X^cY, XY, X^cX^c and XX^c. Therefore, 50% of children are colour blind, 25% have normal vision and 25% are the carriers of the disease.

Hence, the correct option is (B).