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 carrierThis 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

When can a female be colour blind?(a) Father has normal vision and the

1.	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 carrierThis 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» 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.

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