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The gain or loss of one or more chromosomes from a normal set, as seen in Trisomy and Monosomy, is called what?
AEuploidy
BAneuploidy
CTetraploidy
DTriploidy
Answer & Solution
Correct answer: B. Aneuploidy
1. A change in chromosome number can be a whole-set change or a single-chromosome change.
2. The loss or gain of one or more individual chromosomes is called aneuploidy.
3. Trisomy (2n+1) and Monosomy (2n-1) are examples of aneuploidy.
4. Euploidy involves whole extra sets such as 3n or 4n, which rules out option A.
5. So the condition is aneuploidy, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Mutation", p.277_
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