Question:
Aneuploidy refers to
Aneuploidy refers to
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Aneuploidy involves a change in the number of individual chromosomes, not complete sets.
Updated On: Nov 13, 2026
- addition or deletion of one or more chromosomes to the total number.
- addition of entire set of chromosome to the primary basic number.
- haploid set of chromosomes.
- tetraploid set of chromosomes.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Chromosomal number changes can be euploidy (whole sets) or aneuploidy.
Step 2: Definition
Aneuploidy is the gain or loss of one or more chromosomes, as in Down syndrome (trisomy 21) and Turner syndrome.
Step 3: Compare the options
Addition of a whole set is polyploidy, and haploid and tetraploid sets are euploid conditions. The first option defines aneuploidy.
Final Answer:
Aneuploidy is addition or deletion of one or more chromosomes to the total number. \[ \boxed{\text{(A) }\text{addition or deletion of one or more chromosomes to the total number.}} \]
Chromosomal number changes can be euploidy (whole sets) or aneuploidy.
Step 2: Definition
Aneuploidy is the gain or loss of one or more chromosomes, as in Down syndrome (trisomy 21) and Turner syndrome.
Step 3: Compare the options
Addition of a whole set is polyploidy, and haploid and tetraploid sets are euploid conditions. The first option defines aneuploidy.
Final Answer:
Aneuploidy is addition or deletion of one or more chromosomes to the total number. \[ \boxed{\text{(A) }\text{addition or deletion of one or more chromosomes to the total number.}} \]
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