Question

How does gel electrophoresis work?

Answer 1

Smaller DNA segments move more easily through the gel.

Step-by-step explanation:

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Answer 2

Here is the simple answer:
It basically rips the DNA into pieces and those pieces are placed into the gel. The gel has holes throughout the contaioner and allowing the DNA pieces to wiggle through. These are pulled by an electric potential (or voltage) that attracts the DNA pieces. The larger the piece of DNA the shorter distance it will travel through the gel.