Which of the following gene controls corn borer?

Options

A. cery I Ac
B. cry II Ab
C. Bt
D. cry I Ab

Answer

To determine which gene controls corn borer, we need to analyze the options given and understand the role of each gene in pest control.

### Step-by-Step Solution:

1. **Understanding the Options**: The options provided are:
- C
- RY1AC
- CRY2AB
- BT
- CRY1AB

2. **Identifying the Function of BT Toxin**: The BT (Bacillus thuringiensis) toxin is an endotoxin produced by the bacterium Bacillus thuringiensis. It is known for its effectiveness in controlling various insect pests by producing proteins that are toxic to specific insects.

3. **Analyzing the Cry Genes**:
- **Cry1AC**: This gene is known to control cotton bollworms, not corn borers.
- **Cry2AB**: Similar to Cry1AC, this gene also targets cotton bollworms.
- **Cry1AB**: This gene is specifically known for controlling corn borers. It produces a protein that is toxic to these pests.

4. **Conclusion**: Since the question specifically asks for the gene that controls corn borer, the correct answer is **CRY1AB**.

### Final Answer:
The gene that controls corn borer is **CRY1AB**.

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