NEET Biology question

A person whose father is colour blind marries a lady whose mother is the daughter of a colour-blind man. Their children will be

(A)All sons colour blind
(B)Some sons normal and some colour blind
(C)All colour blind
(D)All daughters normalCorrect

Answer: (D)

Solution

Since this is the man's own X (inherited only from his mother, not his father), his father's colour-blindness is irrelevant to his own genotype; being phenotypically normal, he is . Tracing the lady's lineage: her maternal grandfather was colour blind (), so her mother was necessarily a carrier (); the

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Question ID VK-120255