Question

Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X$-chromosome and some on $Y$-chromosome.

• A. If both Assertion and Reason are true and the reason is the correct explanation of the assertion.
• B. If both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
• C. If Assertion is true statement but Reason is false.
• D. If both Assertion and Reason are false statements.

Answer 1

Answer: (C)

In humans, sex is determined by sex chromosomes. Sex chomosomes in human female are $XX$ and in human male are $XY$. Human male produces $X$-containing and $Y$ containing gametes, while human females only $X$-containing gametes. Therefore, males determine the sex of offspring. Sex in humans is a monogenic trait.