Most diagnostic character of centromere is :-

Options

A. Kinetochore
B. Kinetosome
C. Satellite body
D. Chromonema

Answer

**Step-by-Step Solution:**

1. **Understanding Centromere**: The centromere is a region of a chromosome where the two sister chromatids are joined together. It plays a crucial role during cell division.

2. **Identifying Key Features**: The most diagnostic character of a centromere is its association with specific structures that facilitate the movement of chromosomes during cell division.

3. **Role of Kinetochore**: The kinetochore is a protein structure that forms on the centromere during cell division. It serves as the attachment point for spindle fibers, which are essential for the separation of sister chromatids.

4. **Function During Cell Division**: During mitosis and meiosis, the kinetochore links the chromosomes to the microtubules of the mitotic spindle. This connection is crucial for the proper segregation of chromosomes into daughter cells.

5. **Conclusion**: Given the role of the kinetochore in chromosome movement and its association with the centromere, the most diagnostic character of the centromere is the presence of the kinetochore.

**Final Answer**: Kinetochore

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