Question

Assertion (A): Sex of the children will be determined by what they inherit from their mother. Reason (R): Women have XX sex chromosomes.

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

Answer 1

The Correct Option is D

Step 1: Analyze Assertion (A)
Assertion (A): The sex of the children is determined by their maternal inheritance.
❌ This statement is false. A child's sex is determined by the sex chromosome inherited from the father.
- Mothers contribute an X chromosome.
- Fathers contribute either an X or a Y chromosome.
- XX (inheriting X from father) results in a girl.
- XY (inheriting Y from father) results in a boy.

Step 2: Analyze Reason (R)
Reason (R): Females have XX sex chromosomes.
✔️ This statement is true. Females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).

Step 3: Check the logical connection
The assertion is false, and the reason is true. The true reason does not logically support the false assertion.

Final Answer:
Assertion (A) is false, but Reason (R) is true.