Question

A colour blind man marry with a daughter of colour blind father, the 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

Answer: (D)

half sons will be colour blind

Answer 2

A colour blind man marry with a daughter of colour blind father. The generation will be half sons colour blind. Daughter of colour blind person is a carrier of this disease, i.e. one X-chromosome have recessive genes. Therefore, half sons will be colour mblind.