The region of the attachment of chromosome to spindle fibers is called

Options

A. Centromere
B. Centriole
C. Chromonemata
D. Centrosome

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the specific region on a chromosome where it attaches to spindle fibers during cell division.

2. **Identifying the Options**: The options provided are:
- A) Centromere
- B) Centriole
- C) Chromonemata
- D) Centrosome

3. **Analyzing Each Option**:
- **A) Centromere**: This is the part of the chromosome where the sister chromatids are linked together. During cell division, spindle fibers attach to the centromere via a structure called the kinetochore. This makes centromere the correct answer.
- **B) Centriole**: Centrioles are organelles that help organize microtubules in the cell but are not directly involved in the attachment of chromosomes to spindle fibers.
- **C) Chromonemata**: These are the coiled structures of chromatids and do not refer to the attachment point of spindle fibers.
- **D) Centrosome**: The centrosome is the main microtubule organizing center in animal cells but does not serve as the attachment point for chromosomes.

4. **Conclusion**: The correct answer is **A) Centromere** because it is the region where the spindle fibers attach to the chromosomes during cell division.

**Final Answer**: The region of the attachment of chromosome to spindle fibers is called the **centromere**.

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