Write the principle involved in the separation of DNA fragments by gel electrophoresis

Explanation

**Step-by-Step Solution:**

1. **Understanding Gel Electrophoresis**: Gel electrophoresis is a laboratory technique used to separate DNA fragments based on their size and charge.

2. **Loading DNA Samples**: The DNA samples are prepared and loaded into wells created in a gel matrix, typically made of agarose or polyacrylamide.

3. **Applying Electric Current**: Once the DNA samples are loaded, an electric current is applied across the gel. This causes the DNA fragments to migrate through the gel.

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