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In meiosis, centromeres of chromosomes d...

In meiosis, centromeres of chromosomes divide during-

A

anaphase of meiosis-II

B

metaphase of meiosis-I

C

anaphases of meiosis-I

D

prophase of meiosis-II

Text Solution

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The correct Answer is:
To determine when the centromeres of chromosomes divide during meiosis, we need to analyze the stages of meiosis and understand the role of centromeres in this process. ### Step-by-Step Solution: 1. **Understanding Meiosis**: Meiosis consists of two main stages: Meiosis I and Meiosis II. Each of these stages has several phases: prophase, metaphase, anaphase, and telophase. 2. **Centromere Function**: The centromere is the region of a chromosome where the two sister chromatids are joined together. During cell division, the separation of sister chromatids is crucial for ensuring that each daughter cell receives the correct number of chromosomes. 3. **Meiosis I**: In Meiosis I, homologous chromosomes are separated, but the centromeres do not divide. Therefore, during anaphase I, the centromeres remain intact, and the homologous chromosomes are pulled apart to opposite poles. 4. **Meiosis II**: In Meiosis II, which is similar to mitosis, the centromeres do divide. This occurs during anaphase II, where the sister chromatids are separated and pulled to opposite poles of the cell. 5. **Analyzing the Options**: - **Option I: Anaphase I**: Incorrect, as centromeres do not divide during this phase. - **Option II: Metaphase I**: Incorrect, as there is no division of centromeres in this phase. - **Option III: Anaphase II**: Correct, as this is when the centromeres divide, allowing sister chromatids to separate. - **Option IV: Prophase II**: Incorrect, as this phase involves the condensation of chromosomes, not the division of centromeres. 6. **Conclusion**: The correct answer is that the centromeres of chromosomes divide during **anaphase II of meiosis II**. ### Final Answer: In meiosis, centromeres of chromosomes divide during **anaphase II**.
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Knowledge Check

  • In meiosis, the chromosomes replicate during

    A
    Prophase
    B
    metaphase
    C
    anaphase
    D
    interphase
  • Assertion: During anaphase, centromere of each chromosome splites and chromatids separate. Reason: During anaphase, chromatids move to opposte poles.

    A
    If both assertion and reason are true and reason is the correct explantion of assertion
    B
    If both assertion and reason are true but reason is not the correct explnantion of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.
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