Question:
Which of the following terms refers to any chromosome number that is not an exact multiple of the haploid number of chromosomes?
Which of the following terms refers to any chromosome number that is not an exact multiple of the haploid number of chromosomes?
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If entire sets change, it is Euploidy (Diploid, Polyploid). If individual chromosomes are added or lost (e.g., \(2n+1\)), it is Aneuploidy.
Updated On: Jul 10, 2026
- Tetraploidy
- Aneuploidy
- Diploid
- Hexaploidy
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Cytogenetics classifies chromosomal variations based on the gain or loss of individual chromosomes (aneuploidy) or entire sets of chromosomes (euploidy/polyploidy).
Step 2: Detailed Explanation:
- Euploidy is the state of having a chromosome number that is an exact multiple of the haploid set (\(n\)), such as diploid (\(2n\)), triploid (\(3n\)), tetraploid (\(4n\)), or hexaploid (\(6n\)).
- Aneuploidy is the condition where a cell or organism has an abnormal chromosome number that is not an exact multiple of the haploid set. It occurs when individual chromosomes are added or lost during cell division (nondisjunction).
Common examples include monosomy (\(2n-1\)), trisomy (\(2n+1\)), and nullisomy (\(2n-2\)).
Step 3: Final Answer:
Any chromosome number that is not an exact multiple of the haploid set is called aneuploidy.
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