(C) Aneuploidy is the gain or loss of one or more chromosomes. It is classified as hypoploidy (loss of chromosomes) or hyperploidy (gain of chromosome

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If the Assertion is correct but Reason is incorrect.

(C) Aneuploidy is the gain or loss of one or more chromosomes. It is classified as hypoploidy (loss of chromosomes) or hyperploidy (gain of chromosomes).Monosomy is represented as $(2n - 1)$,which means the loss of a single chromosome,not a pair of chromosomes.Therefore,the Assertion is correct,but the Reason is incorrect.

Class 12 Biology Principles of Inheritance and Variation Chromosomal disorders

Medium

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

AIIMS 2011 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.