Question

When can a female be colour blind?

(a) Father has normal vision and the mother is a carrier

(b) Father has normal vision and mother is colour blind

(c) Father is colour blind and the mother has a normal vision

(d) Father is colour blind and mother is a carrier

This question was addressed to me in an internship interview.

My question is from Inheritance and Variation Principles in chapter Principles of Inheritance and Variation of Biology – Class 12

Answer 1

The correct option is (d) Father is colour blind and mother is a carrier

The explanation is: A female can be a colour blind only in two conditions:

i. When her father is colour blind and her mother is the carrier of this disease

ii. When both her father and her mother are colour blind

Therefore, for a female to be colour blind, her father must also have colour blindness.