If rDNA is introduced in a gene coding for ampicillin , then

Options

A. The host will become resistant for ampicillin .
B. The host will loose resistant for ampicillin.
C. The host will start producing ampicillin
D. The host will start producing tetracycline.

Answer

To solve the question regarding the introduction of recombinant DNA (rDNA) into a gene coding for ampicillin, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding rDNA**:
- Recombinant DNA (rDNA) is a form of DNA that has been artificially created by combining DNA from different organisms. It is often used in genetic engineering.

2. **Identifying the Gene Function**:
- The gene in question codes for ampicillin, which is an antibiotic. In bacteria, certain genes can provide resistance to antibiotics, including ampicillin.

3. **Effects of Introducing rDNA**:
- When rDNA is introduced into a gene that codes for ampicillin, it can alter the function of that gene. This can lead to changes in how the host organism responds to ampicillin.

4. **Analyzing the Options**:
- **Option A**: "The host will become resistant to the ampicillin."
- This is incorrect because introducing rDNA that codes for ampicillin does not enhance resistance.
- **Option B**: "The host will lose the resistance for the ampicillin."
- This is correct. The introduction of rDNA could disrupt the existing resistance mechanism.
- **Option C**: "The host will start producing ampicillin."
- This is incorrect. The host does not produce ampicillin; it is an antibiotic that is produced by certain bacteria.
- **Option D**: "The host will start producing tetracycline."
- This is also incorrect as tetracycline is a different antibiotic and not related to the ampicillin gene.

5. **Conclusion**:
- The correct answer is **Option B**: "The host will lose the resistance for the ampicillin."