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The common events in both mitosis and me...

The common events in both mitosis and meiosis are
I. Bivalent formation
II. Splitting of centromeres is only once
III. Two cycles of nuclear division
IV. Condensation and decondensation of chromosomes

A

I, II

B

II, IV

C

I, III

D

II, IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine the common events in both mitosis and meiosis, we will analyze each of the given options step by step. ### Step-by-Step Solution: 1. **Evaluate Option I: Bivalent formation** - Bivalent formation occurs during prophase I of meiosis, specifically during the pachynema stage, where homologous chromosomes pair up. This event does not occur in mitosis. - **Conclusion**: This option is incorrect. 2. **Evaluate Option II: Splitting of centromeres is only once** - In mitosis, the centromeres split during anaphase, allowing sister chromatids to separate. In meiosis, the centromeres split during anaphase II. Thus, in both processes, the centromeres split only once during their respective anaphase stages. - **Conclusion**: This option is correct. 3. **Evaluate Option III: Two cycles of nuclear division** - Mitosis consists of one cycle of nuclear division, while meiosis consists of two cycles (meiosis I and meiosis II). Therefore, this statement does not apply to both processes. - **Conclusion**: This option is incorrect. 4. **Evaluate Option IV: Condensation and decondensation of chromosomes** - Both mitosis and meiosis involve the condensation of chromosomes during prophase and the decondensation during telophase. This is a common event in both processes. - **Conclusion**: This option is correct. ### Final Answer: The common events in both mitosis and meiosis are: - **Correct Options**: II (Splitting of centromeres is only once) and IV (Condensation and decondensation of chromosomes).
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