Question
Biology Question on body fluids and circulation
What percentage of children are colour blind if their father is colour blind and the mother is a carrier for Colour blindness?
A
(A) 25%
B
(B) 50%
C
(C) 75%
D
(D) 100%
Answer
(B) 50%
Explanation
Solution
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 Xc and X chromosomes. Their children will have the genotypes- XcY, XY, XcXc and XXc. 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).