Question

two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
Assertion (A): Chromosomes inherited from the parents decide the sex of a child.
Reason (R): Y chromosome in a male child is inherited from the father.

• 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 and Reason (R) is false.
• D. Assertion (A) is false and Reason (R) is true.

Answer 1

The Correct Option is B

Assertion (A) is true. The sex of a child is determined by the combination of sex chromosomes inherited from both parents. A child inherits an X chromosome from the mother and either an X or a Y chromosome from the father. XX results in a female, while XY results in a male.

Reason (R) is also true but it is a direct consequence of (A). A male child receives a Y chromosome from their father, while the mother always contributes an X chromosome. The presence of the Y chromosome is the primary factor that determines the child’s male sex.