The segment of DNA which participates in crossing over is termed as

Options

A. Recon
B. Cistron
C. Muton
D. Operon

Answer

To answer the question, "The segment of DNA which participates in crossing over is termed as," we need to analyze the options provided and understand the context of crossing over in genetics.

### Step-by-Step Solution:

1. **Understanding Crossing Over**:
- Crossing over is a process that occurs during meiosis, specifically in prophase I. It involves the exchange of genetic material between homologous chromosomes.

2. **Identifying the Options**:
- The options given are:
- A) Rechen
- B) Sestron
- C) Muton
- D) Operon

3. **Evaluating Each Option**:
- **Rechen**: This term is not commonly used in genetics, but it seems to be a misspelling or misinterpretation of "recombination" or "recombinant DNA," which is related to crossing over.
- **Sestron**: This term does not have a recognized meaning in the context of genetics or crossing over.
- **Muton**: This refers to the smallest unit of mutation, which is not specifically related to crossing over.
- **Operon**: This is a cluster of genes regulated together, primarily found in prokaryotes, and does not pertain to the process of crossing over.

4. **Correct Answer**:
- Given the context and the options, the correct term that refers to the segment of DNA participating in crossing over is **Rechen** (assuming it refers to recombination). However, the correct term in genetics is actually "chiasma," where the actual crossing over occurs.

### Final Answer:
The segment of DNA which participates in crossing over is termed as **Rechen** (though the correct term is "chiasma").