Question

Assertion (A): A male individual always inherits haemophilia from his mother.
Reason (R): The gene for haemophilia lies on X-chromosome.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

X-linked traits in males come exclusively from the mother’s X chromosome.

Answer 1

The Correct Option is A

Haemophilia is an X-linked recessive disorder. Males inherit their single X chromosome from their mother, so if she carries the defective gene, it gets expressed in the male child.