The Question is from neet-botany cell-cycle-and-cell-division meiosis, and it was created by the author D VINOD

Question

Which of the following statement(s) is/are not correct about meiosis?
I. Meiosis involves pairing of homologous chromosomes and recombination between them
II. Two diploid cells are formed at the end of meiosis-II
III. Meiosis involves two sequential cycles of nuclear and cell division called meiosis-I and meiosis-II, but only a single cycle of DNA replication
IV. Meiosis-I is initiated after the parental chromosome replication which produce identical sister chromatids at the S-phase
The correct option is

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
**Primary Concept**: Meiosis and its stages
**Related Topics**: Cell division, chromosome structure, ploidy
**Prerequisites**: Basic understanding of cell division, mitosis, and chromosome structure.
## SOLUTION PATHWAY
**Given Information**:
Statements about meiosis and its characteristics.
**Method & Steps**:
1. Analyze each statement for correctness based on the knowledge of meiosis.
2.  Identify the statements that are incorrect.
3. Select the option that corresponds to the incorrect statements.
    
**Statement Analysis**:
*   **I. Meiosis involves pairing of homologous chromosomes and recombination between them**: This statement is **correct**. Homologous chromosomes pair up during prophase I of meiosis, and crossing over (recombination) occurs between them.
*   **II. Two diploid cells are formed at the end of meiosis-II**: This statement is **incorrect**. Meiosis II results in the formation of four haploid cells, not two diploid cells. Meiosis I reduces the ploidy from diploid to haploid, and Meiosis II maintains that haploid state.
*   **III. Meiosis involves two sequential cycles of nuclear and cell division called meiosis-I and meiosis-II, but only a single cycle of DNA replication**: This statement is **correct**. DNA replication occurs only once before meiosis I starts. There is no DNA replication between meiosis I and meiosis II.
*   **IV. Meiosis-I is initiated after the parental chromosome replication which produce identical sister chromatids at the S-phase**: This statement is **correct**. The S-phase of interphase results in the formation of sister chromatids, and meiosis I begins after this replication.

**Conclusion**: Only statement II is incorrect.
## OPTION ANALYSIS
[A] :x: Incorrect because statement I and III are correct.
[B] ✓: Correct because only statement II is incorrect.
[C] :x: Incorrect because statement III is correct.
[D] :x: Incorrect because statement I, III and IV are correct.
## LEARNING AIDS
**Common Mistakes**:
1. Confusing the ploidy of cells at different stages of meiosis. Remember that meiosis reduces the ploidy by half.
2. Forgetting that DNA replication occurs only once before meiosis I.
**Quick Tips**:
1. Remember that meiosis I is a reductional division (diploid to haploid) and meiosis II is an equational division (haploid to haploid).
2. Visualize the process of meiosis with diagrams to understand the chromosome movements and ploidy changes.

D VINOD · Answer

I and III

D VINOD · Answer

The correct Option is "II only"

D VINOD · Answer

II and III

D VINOD · Answer

I, II, III and IV

NEET Botany Cell Cycle and Cell Division Meiosis MCQs

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