If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

Step-by-step solution

Colour blindness is an X-linked disorder. For colour blindness to be effective, all X chromosomes within an individual must be affected, and since men only have one X chromosome and women have two, the chances of men being impacted are exponentially higher. However, in this case, the mother is colour-blind and hence she carries X C X C genotype. Father’s mother is also colour-blind and hence even she will be having the genotype as X C X C , and she will be transferring her X C chromosome to her son and hence,