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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 polygenic trait dependent upon the cumulative effect of some genes on X-chromosome and some on Y-chromosome.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Both male and female gametes have identical 22 chromosomes. As for the 23rd chromosome, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.
Skin colour in humans is polygenic trait dependent upon the cumulative effect of some genes.
So, the correct option is 'Assertion is correct but Reason is incorrect.'

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