Microtubules from opposite poles of spindle get attached to kinetochores of sister chromatids during

Options

A. anaphase II
B. metaphase II
C. metaphase I
D. prophase II

Answer

To solve the question regarding when microtubules from opposite poles of the spindle attach to kinetochores of sister chromatids, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Context**:
- The question pertains to the process of meiosis, specifically the second meiotic division (meiosis II).

2. **Identifying Key Terms**:
- **Microtubules**: These are structural components of the spindle apparatus that help in the movement of chromosomes.
- **Kinetochores**: These are protein structures on the chromosome where the spindle fibers attach.
- **Sister Chromatids**: These are identical copies of a chromosome that are connected at a region called the centromere.

3. **Analyzing the Phases of Meiosis II**:
- Meiosis II consists of several phases: prophase II, metaphase II, anaphase II, and telophase II.
- During **metaphase II**, chromosomes align at the metaphase plate, and spindle fibers attach to the kinetochores of sister chromatids.

4. **Identifying the Correct Phase**:
- In **metaphase II**, the microtubules from opposite poles of the spindle apparatus attach to the kinetochores of sister chromatids, preparing them for separation.
- In **anaphase II**, the sister chromatids are pulled apart, but the attachment occurs in metaphase II.
- **Prophase II** and **metaphase I** do not involve the attachment of microtubules to kinetochores of sister chromatids in the same manner.

5. **Conclusion**:
- Based on the analysis, the correct answer to the question is **B) Metaphase II**.

### Final Answer:
**B) Metaphase II**