NEET Biology question

A couple whose sons are colourblind with AB blood group, identify the parents from the following.

(A)Mother colourblind with A blood group, and father normal with blood group-BCorrect
(B)Mother normal with blood group-A, and father colourblind with blood group-B
(C)Mother colourblind with blood group-B, and father normal with blood group-A
(D)Mother normal with blood group-B, and father colourblind with blood group-A

Answer: (A)

Solution

Since every son is colourblind, the mother must be homozygous recessive (, i.e. colourblind herself), as a carrier mother would give only some colourblind sons, not all; for

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Question ID VK-119649