Question

Assertion (A): Haemophilia is a recessive sex-linked disease.

Reason (R): Haemophilia occurs due to the absence of a clotting factor in the blood.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

Explanation:

Haemophilia is a recessive X-linked disorder, and it results from a deficiency of a blood-clotting factor. The clotting-factor deficiency explains the bleeding symptoms, not why the inheritance is sex-linked and recessive.