Q. 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 -chromosome and some on -chromosome.

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Solution:

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