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(a) Both Assertion & Reason are true and the reason is the correct explanation of the assertion
- B(b) Both Assertion & Reason are true but the reason is not the correct explanation of the assertion
- C(c) Assertion is true statement but Reason is false
- D(d) Both Assertion and Reason are false statements
Solution & Step-by-step Explanation
Human females are XX and produce only X-containing gametes, while males are XY and produce both X and Y-containing gametes. The sex of the child is determined by whether an X or Y sperm fertilizes the egg. Human sex is monogenic (determined by single chromosomes), not polygenic. Therefore, the assertion is true but the reason is false.