In which stage the centromere lie at equator and arms are directed towards poles :-

Options

A. Metaphase of mitosis
B. Metaphase -I
C. Metaphase -II
D. 1 and 3 both

Answer

To answer the question "In which stage do the centromeres lie at the equator and the arms are directed towards the poles?", we will analyze the stages of mitosis and meiosis.

### Step-by-Step Solution:

1. **Understanding the Stages**:
- The stages of cell division include prophase, metaphase, anaphase, and telophase. In both mitosis and meiosis, there are specific phases where the chromosomes are aligned and separated.

2. **Identifying Metaphase**:
- In metaphase, chromosomes align at the equatorial plane of the cell. This is true for both mitosis (metaphase) and meiosis (metaphase I and II).

3. **Analyzing Centromere Position**:
- During metaphase, the centromeres of the chromosomes are positioned at the equator of the cell, and the arms of the chromosomes extend towards the poles.

4. **Differentiating Between Mitosis and Meiosis**:
- In **metaphase I** of meiosis, homologous chromosomes align at the equator, but they are not separated yet.
- In **metaphase II** of meiosis, sister chromatids align at the equator, similar to mitosis.

5. **Conclusion**:
- The correct answer to the question is **metaphase of mitosis** and **metaphase II of meiosis**. Both stages have centromeres at the equator and arms directed towards the poles.

### Final Answer:
The stage in which the centromere lies at the equator and the arms are directed towards the poles is **metaphase of mitosis** and **metaphase II of meiosis**.

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