The bivalents are attached to the spindle at:

Options

A. centriole
B. centromere
C. chromomere
D. chromatids

Answer

To solve the question "The bivalents are attached to the spindle at:", we will go through the following steps:

### Step-by-Step Solution:

1. **Understanding Bivalents**:
- Bivalents are structures formed during meiosis when homologous chromosomes pair up. Each bivalent consists of two homologous chromosomes, each made up of two sister chromatids.

2. **Identifying the Role of the Spindle Apparatus**:
- During cell division, the spindle apparatus is responsible for separating the chromosomes. It attaches to the chromosomes to pull them apart to opposite poles of the cell.

3. **Locating the Attachment Point**:
- The point where the spindle fibers attach to the chromosomes is crucial for the correct separation of the genetic material. This attachment occurs at a specific region on the chromosome.

4. **Recognizing the Correct Term**:
- The central point of the chromosome where the spindle fibers attach is known as the centromere. This is the region that holds the two sister chromatids together and is essential for the proper movement of chromosomes during cell division.

5. **Choosing the Correct Option**:
- Given the options:
- A. Centrioles
- B. Centromere
- C. Chromomere
- D. Chromatids
- The correct answer is B. Centromere, as it is the specific site where bivalents attach to the spindle fibers during meiosis.

### Final Answer:
The bivalents are attached to the spindle at **B. Centromere**.

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