Chromosomes with two chromatids move towards poles in

Options

A. Anaphase
B. Anaphase-I
C. Anaphase-II
D. Metaphase-I

Answer

To answer the question "Chromosomes with two chromatids move towards poles in," we will analyze the different phases of cell division and identify the correct phase where this movement occurs.

### Step-by-Step Solution:

1. **Understand the Cell Cycle and Mitosis**:
- The cell cycle consists of several phases, and mitosis is a key process in cell division that results in two daughter cells. Mitosis has four main stages: prophase, metaphase, anaphase, and telophase.

2. **Identify the Phases of Mitosis**:
- **Prophase**: Chromosomes condense and become visible. The nuclear envelope breaks down, and spindle fibers start to form.
- **Metaphase**: Chromosomes align at the metaphase plate (equatorial plane) of the cell. At this stage, there is no movement towards the poles.
- **Anaphase**: This is the stage where the sister chromatids (which are the two identical halves of a chromosome) are pulled apart and move towards opposite poles of the cell.
- **Telophase**: The separated chromatids reach the poles, and the cell begins to divide into two.

3. **Analyze the Options**:
- **Anaphase**: This is the stage where the chromatids move towards the poles.
- **Anaphase I**: In meiosis, homologous chromosomes (not sister chromatids) move towards the poles.
- **Anaphase II**: This involves the movement of sister chromatids towards the poles, but it is part of meiosis, not mitosis.
- **Metaphase I**: In meiosis, homologous chromosomes align at the metaphase plate, similar to metaphase in mitosis.

4. **Conclusion**:
- The correct answer is **Anaphase** (specifically Anaphase in mitosis), where chromosomes with two chromatids move towards the poles.

### Final Answer:
Chromosomes with two chromatids move towards poles in **Anaphase**.

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