The complex formed by a pair of synapsed homologous chromosomes is called

Options

A. Equatorial plate
B. Kinetochore
C. Bivalent
D. Axoneme

Answer

To answer the question, "The complex formed by a pair of synapsed homologous chromosomes is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Synapsis**:
- Synapsis is the process where homologous chromosomes pair up during meiosis. This occurs specifically during the prophase I stage of meiosis.

2. **Identifying the Stage of Meiosis**:
- The specific phase of prophase I where synapsis occurs is called the zygotene stage. During this stage, homologous chromosomes align closely together.

3. **Formation of the Complex**:
- When homologous chromosomes undergo synapsis, they form a structure known as the synaptonemal complex. This structure helps in the alignment of homologous chromosomes.

4. **Terminology**:
- The term used to describe the complex formed by a pair of synapsed homologous chromosomes is known as a **bivalent**. This term is often used interchangeably with **tetrad**, as it refers to the four chromatids (two from each homolog) present in the complex.

5. **Conclusion**:
- Therefore, the correct answer to the question is **bivalent**.

### Final Answer:
The complex formed by a pair of synapsed homologous chromosomes is called a **bivalent**.

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