In gel electrophoresis, negatively/positively charged DNA fragments placed over cathode will move towards anode of an electrical field.

Explanation

### Step-by-Step Solution:

1. **Understanding DNA Charge**:
- DNA molecules carry a negative charge due to the phosphate groups in their backbone. This is a fundamental property of DNA that plays a crucial role in gel electrophoresis.

2. **Setup of Gel Electrophoresis**:
- In gel electrophoresis, a gel matrix (commonly agarose) is used to separate DNA fragments. The gel is placed in an electrophoresis chamber with two electrodes: the cathode (negative electrode) and the anode (positive electrode).

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