Which of the following gene controls com 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 provided and understand the role of the Bacillus thuringiensis (Bt) bacteria and its associated genes.

### Step-by-Step Solution:

1. **Identify the Bacteria**: The question revolves around the bacterium Bacillus thuringiensis (Bt), which produces insecticidal proteins.

**Hint**: Remember that Bacillus thuringiensis is often abbreviated as Bt and is known for its insecticidal properties.

2. **Understand the Mechanism**: The proteins produced by Bt are known as crystal proteins or insecticidal proteins. These proteins are inactive in the bacteria but become active when ingested by insects, leading to their death.

**Hint**: Focus on how the proteins become active and their role in killing insects.

3. **Identify the Genes**: The genes associated with these proteins are referred to as "Cry" genes. For example, Cry1AC and Cry2AB are specific genes that code for proteins targeting different pests.

**Hint**: The names of the genes (Cry1AC, Cry2AB, etc.) indicate their specific functions and the pests they target.

4. **Analyze the Options**: The options given are:
- Cry1AC
- Cry2AB
- Bt
- Cry1AB

We need to determine which of these genes is specifically responsible for controlling corn borer.

5. **Determine the Correct Gene**: According to the information provided, Cry1AB is the gene that controls corn borer. The other options either control different pests or are not specific to corn borer.

**Hint**: Look for the specific gene mentioned in relation to corn borer control.

6. **Conclusion**: The correct answer to the question "Which of the following gene controls corn borer?" is **Cry1AB**.

### Final Answer:
**Cry1AB** is the gene that controls corn borer.