In Which type of division nuclear division takes place twice but division of chromosome occurs only once?

Options

A. Meiosis
B. Fision
C. Mitosis
D. Amitosis

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a type of cell division where nuclear division occurs twice, but the division of chromosomes happens only once.

2. **Identifying the Process**: The process that fits this description is **meiosis**.

3. **Phases of Meiosis**: Meiosis consists of two main stages:
- **Meiosis I**: This is the first round of nuclear division where the cell divides into two haploid cells.
- **Meiosis II**: This is the second round of nuclear division where the two haploid cells divide again.

4. **Chromosome Division**: During the interphase before meiosis begins, the chromosomes are replicated. However, the actual division of chromosomes (separation of sister chromatids) occurs only once during the entire meiosis process, specifically during Meiosis II.

5. **Karyokinesis and Cytokinesis**:
- In Meiosis I, karyokinesis occurs, resulting in two haploid cells.
- In Meiosis II, karyokinesis occurs again, leading to a total of four haploid cells after two rounds of cytokinesis.

6. **Conclusion**: Thus, in meiosis, nuclear division (karyokinesis) takes place twice, but the chromosomes are only divided once during the entire process.

**Final Answer**: The type of division in which nuclear division takes place twice but division of chromosomes occurs only once is **meiosis**.

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