The phase when the actual cell division occurs-

Answer

**Step-by-Step Solution:**

1. **Understanding Cell Division**: Cell division is a crucial process in biology where a parent cell divides to produce daughter cells. It is primarily divided into two main phases: Interphase and M phase.

2. **Interphase**: This is the preparatory phase where the cell prepares itself for division. Interphase is further divided into:
- **G1 Phase**: The cell grows and synthesizes proteins necessary for cell division.
- **S Phase**: DNA replication occurs, resulting in the duplication of chromosomes.
- **G2 Phase**: The cell continues to grow and prepares for mitosis.
- **G0 Phase**: A resting phase where the cell is not actively preparing to divide.

3. **M Phase (Mitotic Phase)**: This is the phase where the actual cell division occurs. It is during this phase that the cell divides its copied DNA and cytoplasm to form two new cells.

4. **Stages of M Phase**: The M phase is further divided into four stages:
- **Prophase**: Chromosomes condense and become visible. The nuclear envelope begins to break down.
- **Metaphase**: Chromosomes align at the cell's equatorial plane.
- **Anaphase**: Sister chromatids are pulled apart toward opposite poles of the cell.
- **Telophase**: The chromosomes arrive at the poles, and the nuclear envelope re-forms around each set of chromosomes.

5. **Conclusion**: The actual cell division occurs during the M phase, specifically through the stages of prophase, metaphase, anaphase, and telophase.

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