Mutation that occurs due to addition of a part of chromosome so that gene(s) is/are represented twice,is called

Options

A. Addition
B. Insertion
C. Duplication
D. Transition

Answer

To solve the question regarding the type of mutation that occurs due to the addition of a part of a chromosome so that gene(s) are represented twice, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a specific type of mutation where a gene is represented twice due to the addition of a part of a chromosome.

2. **Identifying the Mutation Type**:
- There are various types of mutations, including deletion, insertion, duplication, and translocation.
- The key term in the question is "represented twice," which indicates that a particular gene is duplicated.

3. **Visualizing the Mutation**:
- If we take a chromosome segment with genes labeled as A, B, C, D, E, and F, and if gene C is duplicated, the new sequence would look like:
- Original: A, B, C, D, E, F
- After duplication: A, B, C, C, D, E, F
- This shows that gene C is now represented twice.

4. **Defining Duplication**:
- Duplication is a type of mutation where a segment of DNA is copied, resulting in the presence of additional copies of that segment.
- In this case, gene C is duplicated, confirming that the mutation is indeed a duplication.

5. **Conclusion**:
- Based on the analysis, the correct answer to the question is "duplication."

### Final Answer:
The mutation that occurs due to the addition of a part of a chromosome so that gene(s) is/are represented twice is called **duplication**.

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