Q. A boy has a normal brother and a colourblind sister. What is true about his parents?
A) His father was normal but mother was colourblind
B) His father was colourblind but mother was carrier
C) Both father and mother were colourblind
D) Both father and mother were normal
Explanation
If the father is colourblind $(X^{c}Y)$ and the mother is a carrier$\ \left( X^{c}X \right),$ then their son will be normal(XY) and daughter will be colourblind $\left( X^{c}X^{c} \right).$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.