alleryHaemophilia in humans is inherited as:
AAn autosomal dominant trait
BAn autosomal recessive trait
CA Y-linked dominant trait
DAn X-linked recessive trait
Answer & Solution
Correct answer: D. An X-linked recessive trait
Haemophilia is X-linked recessive.
Carrier mothers transmit the affected X to half of their sons, who express the disease since they have only one X chromosome.
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