The stage at which cleavage or cytokinesis begins in animal cells is

Options

A. Anaphase
B. Telophase
C. `G_(0)`phase
D. Interphase

Explanation

**Step-by-Step Solution:**

1. **Understanding Cytokinesis**: Cytokinesis is the process that divides the cytoplasm of a parental cell into two daughter cells. It is essential for ensuring that each daughter cell receives one nucleus.

2. **Phases of Cell Division**: Cytokinesis occurs concurrently with two types of nuclear division: mitosis and meiosis. It is important to identify the specific phase during which cytokinesis begins.

3. **Identifying the Correct Phase**: The question asks at which stage cytokinesis begins in animal cells. The options are:
- Anaphase
- Telophase
- G0 phase
- Interphase

4. **Analyzing Each Option**:
- **Anaphase**: This is the stage where the sister chromatids are pulled apart to opposite poles of the cell. Cytokinesis begins during this phase.
- **Telophase**: This is the stage that follows anaphase, where the nuclear membranes start to reform around the separated chromosomes. Cytokinesis continues during this phase but does not begin here.
- **G0 Phase**: This is a resting phase where the cell is not actively preparing to divide. Thus, cytokinesis does not occur here.
- **Interphase**: This is the phase where the cell prepares for division, but no actual division occurs, making it incorrect for the question.

5. **Conclusion**: Based on the analysis, cytokinesis begins during the **anaphase** stage of cell division.

**Final Answer**: The stage at which cleavage or cytokinesis begins in animal cells is **anaphase**.

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