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

Options

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

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. **Understand the Context**: The question pertains to the process of meiosis, a type of cell division that reduces the chromosome number from diploid to haploid.

2. **Identify Key Terms**: The terms "synapsed homologous chromosomes" are crucial. Synapsis refers to the pairing of homologous chromosomes during meiosis.

3. **Define Synapsis**: During prophase I of meiosis, homologous chromosomes pair up closely in a process known as synapsis. This is essential for genetic recombination and proper segregation of chromosomes.

4. **Recognize the Complex Formed**: When homologous chromosomes synapse, they form a structure. This structure is commonly referred to as a "bivalent" or "tetrad."

5. **Evaluate the Options**: The options given were bivalent, axonim, equatorial, and kinetocore.
- **Bivalent**: Correct answer, as it refers to the paired homologous chromosomes.
- **Axonim**: Incorrect, relates to microtubules.
- **Equatorial**: Incorrect, refers to the metaphase plane.
- **Kinetocore**: Incorrect, refers to the structure where spindle fibers attach.

6. **Conclusion**: The correct answer to the question is **bivalent**.

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

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