Assertion :Aneuploidy may be of hypoploidy or hyperploidy type. Reason: Monosomy lacks one pair of chromosomes.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Aneuploidy can be either due to loss of one or more chromosomes (hypoploidy) or due to addition of one or more chromosomes to complete chromosome complement (hyperploidy). Hypoplodiy is mainly due to loss of a single chromosomes; monosomes (2n-1) or due to loss of one pair of chromosomes; nullisomes (2n-2).
Thus, the correct answer is option C.

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