Mobile genetic sequences are called

Options

A. Exons
B. Cistrons
C. Introns
D. Transposons

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks for the term used to describe mobile genetic sequences.

2. **Analyzing the Options:**
- **Option A: Exons**
- Exons are the coding sequences in DNA that are expressed in proteins. They are not mobile.
- **Option B: Cistrons**
- Cistrons refer to segments of DNA that encode for a single polypeptide chain. They include both coding and non-coding sequences but are not mobile.
- **Option C: Introns**
- Introns are non-coding sequences found within genes. They do not code for proteins and are also not mobile.
- **Option D: Transposons**
- Transposons are segments of DNA that can move from one location to another within the genome. They are often referred to as "jumping genes" due to their ability to relocate.

3. **Identifying the Correct Answer:**
- After analyzing all the options, transposons (Option D) are the only mobile genetic sequences among the choices provided.

4. **Conclusion:**
- Therefore, the correct answer to the question "Mobile genetic sequences are called" is **transposons**.

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