Bt crops are resistant to pests. Name the gene responsible for pest resistance.

Explanation

To answer the question about the gene responsible for pest resistance in Bt crops, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Bt Crops**:
- Bt crops are genetically modified plants that have been engineered to express a specific protein that provides resistance to certain pests.

2. **Origin of Bt**:
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