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Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:
AAutosomal dominant inheritance
BAutosomal recessive inheritance
CX-linked recessive disorders
DY-linked dominant disorders
Answer & Solution
Correct answer: C. X-linked recessive disorders
X-linked recessive disorders affect males more frequently because males have only ONE X chromosome. A female needs TWO defective X copies to express; a male needs only one. Mothers can be carriers.
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