Meiosis involves

Options

A. Two nuclear divisions and one chromosome division
B. One nuclear division and one chromosome divison
C. One nuclear division and two chromosome divisions
D. Two nuclear division and two chromosome divisions

Answer

**Step-by-Step Text Solution:**

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells from one diploid cell. It is crucial for sexual reproduction.

2. **Phases of Meiosis**: Meiosis consists of two main stages: Meiosis I and Meiosis II. Each of these stages involves a series of steps that include karyokinesis (nuclear division) and cytokinesis (cytoplasmic division).

3. **Meiosis I**: In Meiosis I, the homologous chromosomes are separated. This is where the actual reduction in chromosome number occurs. It consists of:
- Karyokinesis (nuclear division): This is where the nucleus divides, leading to a reduction in chromosome number.
- Cytokinesis: This is the division of the cytoplasm, resulting in two daughter cells.

4. **Meiosis II**: Meiosis II resembles mitosis, where the sister chromatids are separated. It consists of:
- Karyokinesis: This is the second nuclear division where the sister chromatids are pulled apart.
- Cytokinesis: This is the division of the cytoplasm again, resulting in a total of four haploid cells.

5. **Counting Divisions**:
- In total, there are two karyokinesis events (one in Meiosis I and one in Meiosis II).
- There are also two cytokinesis events (one in Meiosis I and one in Meiosis II).
- However, there is only one chromosome division that occurs during Meiosis I when the homologous chromosomes are separated.

6. **Conclusion**: Therefore, meiosis involves two nuclear divisions and one chromosome division. The correct answer to the question is that meiosis involves "two nuclear divisions and one chromosome division."

**Final Answer**: Two nuclear divisions and one chromosome division.

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