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 .

Options

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

Answer

C

Explanation

(c ) The sex of the child to be born is intially governed, by the chromosomal contribution of the father. All chromosomes are paired, and the Y is dominant over the X chromosome when combined with it. A child conceived will "therefore" be subject during development thereafter to a predisposition toward femaleness if receiving and X chromosome from the mother and an X chromosome from the father (XY), or towards maleness if receiveing an X chromosome from the mother but a Y chromosome from the father (XY) ."Therefore" sex in human is a monogenic not polygenic.