NEET Biology question

Female is haemophilic definitely if

(A)Mother is carrier
(B)Father is carrier
(C)Father is affected
(D)Both mother and father affectedCorrect

Answer: (D)

Solution

Since haemophilia is X-linked recessive, a female can only be affected (homozygous, ) if she receives a mutant allele from both parents; this is guaranteed with certainty only when both the mother and the father are themselves affected (note that a

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Question ID VK-120092