Mention a gene that codes for insecticidal protein in Bt cotton.

Explanation

To answer the question about a gene that codes for insecticidal protein in Bt cotton, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Crop**: Recognize that Bt cotton is a genetically modified organism (GMO) designed to be resistant to certain pests.

2. **Understand the Source**: Know that the resistance in Bt cotton comes from a bacterium called **Bacillus thuringiensis** (Bt).

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