Raj is colour blind, yet every one of his four children has normal colour vision.Which of Raj's grandchildren are most likely to be colour blind?

Question

Quizplus · Accepted Answer

Colour blindness is often passed from a mother to her son, as it is a sex-linked trait carried on the X chromosome. Since Raj is colour blind, his daughters will be carriers of the colour blindness gene. When these daughters have children, their sons have a 50% chance of being colour blind, as they inherit one X chromosome from their mother.

Raj Is Colour Blind, Yet Every One of His Four