Question

Assertion (A): In humans, the gamete contributed by the male determines whether the child produced will be male or female.

Reason (R): Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.

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

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

Explanation:

The assertion is true because an X-bearing sperm produces an XX female and a Y-bearing sperm produces an XY male. The reason is false: human sex determination is not a polygenic trait.