Question:
The failure of paired chromosomes to disjoin during meiosis is called:
The failure of paired chromosomes to disjoin during meiosis is called:
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Non-disjunction: failure to separate.
Causes aneuploidy.
During meiosis I or II.
Causes aneuploidy.
During meiosis I or II.
Updated On: Aug 18, 2026
- Disjunction
- Non disjunction
- Independent assortment
- Segregation
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Chromosome behavior during meiosis is specific.
Abnormalities can occur.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand chromosome segregation.
Step 3: Detailed Explanation:
Non-disjunction is the failure of paired chromosomes to disjoin during meiosis.
This leads to abnormal chromosome numbers.
Disjunction is normal separation.
Independent assortment and segregation are normal processes.
Thus, the failure is called non-disjunction.
Step 4: Final Answer:
Failure of chromosomes to disjoin is called non-disjunction.
Hence, the correct option is (B).
Chromosome behavior during meiosis is specific.
Abnormalities can occur.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand chromosome segregation.
Step 3: Detailed Explanation:
Non-disjunction is the failure of paired chromosomes to disjoin during meiosis.
This leads to abnormal chromosome numbers.
Disjunction is normal separation.
Independent assortment and segregation are normal processes.
Thus, the failure is called non-disjunction.
Step 4: Final Answer:
Failure of chromosomes to disjoin is called non-disjunction.
Hence, the correct option is (B).
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