A) All normal
B) All colour blind
C) All sons colour blind
D) Some sons normal and some colour blind
Correct Answer: D
Solution :
A person whose father is colourblind i.e. person is normal because colour blind genes located on x-chromosome of father and it is transfered into only its daughters. This person marry with a lady whose mother is daughter of colour blind father i.e. lady is carrier for colour blind. Thus normal man marries with a carrier lady and their sons will be some normal and some colour blind.
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