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%I had been asked this question in semester exam.This question is from Inheritance and Variation Principles topic in division Principles of Inheritance and Variation of Biology – Class 12

What percentage of children are colour blind if their father is colour

1.	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%I had been asked this question in semester exam.This question is from Inheritance and Variation Principles topic in division Principles of Inheritance and Variation of Biology – Class 12
Answer» Correct choice is (b) 50% Best explanation: The percentage of children which 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 chromosome and the mother will produce Xc and X chromosomes. Their children will have the genotypes- XcY, XY, XcXc and XcX. Therefore, 50% of children are colour blind, 25% have normal vision and 25% are the carriers of the disease.

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