Question

A colour blind man marry the daughter of colour blind father, the next generation will be

• A. there will be no daughter colour blind
• B. all sons will be colour blind
• C. all daughter will be colour blind
• D. half sons will be colour blind

Answer 1

The correct option is D half sons will be colour blind

If a colour blind man marries the daughter of a colour blind father, half of the sons in the next generation will be colour blind. This is because daughter of a colour blind person gets the defective gene present on his X chromosome and becomes a carrier. Therefore, there is a probability of half of the sons being colour blind.