Question

Ravi’s parent have normal colour vision but his maternal grandfather is colour blind. Gene for colour vision is located on X-chromosome.

1. Work out a cross showing the per cent chances of Ravi and his siblings being colour blind.
2. What is the genotype of his mother?
3. What is the term used for this kind of inheritance?

Answer 1

1. Ravi may be normal or colour blind, his siblings sons normal, daughter carrier.
2. Xx carrier
3. Sex-linked inheritance.