Aster disappears in

Options

A. Telophase
B. Metaphase
C. Anaphase
D. `G_(1)` phase

Answer

**Step-by-Step Solution:**

1. **Understanding Aster Formation**: Asters are star-shaped structures that form during cell division, particularly during mitosis. They are made up of microtubules and are crucial for the movement of chromosomes.

2. **Identifying the Phases of Mitosis**: Mitosis consists of several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct characteristics and functions.

3. **Aster Appearance**: Asters appear during prophase. This is the phase where the spindle apparatus begins to form, and the aster rays help in the separation of chromosomes.

4. **Aster Behavior in Different Phases**:
- **Metaphase**: During this phase, chromosomes align at the equatorial plate, and the aster is still present as it helps in anchoring the spindle fibers to the chromosomes.
- **Anaphase**: In this phase, the sister chromatids are pulled apart toward opposite poles of the cell, and the aster continues to play a role in this movement.
- **Telophase**: This is the final phase of mitosis where the chromosomes reach the poles, and the nuclear envelope begins to reform. During this phase, the aster structures begin to disappear as the spindle apparatus disassembles.

5. **Conclusion**: Based on the behavior of aster structures during the different phases of mitosis, it is clear that aster disappears during telophase.

**Final Answer**: Aster disappears in **telophase**.

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