Assertion : In humans, the gamete contributed by the male determines wheter the child produced will be male or female
Reason : Sex in humasn is a polygenic trait depending upon a cumulative efffect of some genes on X-chromosome and some on Y-chromosome . a. If both the assertion and the reason are true and the reasons is a correct explanation of the assertion b. If both the assertion and reason are true but the reason is not a correct explanation of the assertion c. If the assertion is true but the reson is false d. If both the assertion and reason are false

Sure, here are the step by step solutions: 1. The sex of the child is initially determined by the chromosomal contribution of the father. 2. All chromosomes are paired, and the Y chromosome is dominant over the X chromosome when combined with it. 3. If the child receives an X chromosome from the mother and an X chromosome from the father (XX), they will be predisposed towards femaleness during development. 4. If the child receives an X chromosome from the mother and a Y chromosome from the father (XY), they will be predisposed towards maleness during development. 5. Therefore, sex in humans is determined by a single gene, making it monogenic and not polygenic.