NEET Biology question

Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on

(A)X-chromosome of father
(B)Y-chromosome of father
(C)One X-chromosome of motherCorrect
(D)Both the X-chromosomes of mother

Answer: (C)

Solution

Both parents are phenotypically normal, yet half the sons are haemophiliac and half the daughters are carriers — this is exactly the expected outcome of crossing a carrier mother () with a normal father (): sons receive either (haemophiliac, 50%) or (normal, 50%) from the mother, and daughters

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Question ID VK-120158