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☆☆☆☆☆Gel electrophoresis is a common method to study DNA. It is a very basic way of comparing the mass (mostly size or length of DNA).
The main principle behind gel electrophoresis is that DNA has a slight negative charge. When put in a gel (usually agarose gel) DNA will travel through the gel towards a positive charge, which is generated by the electrophoresis machine.
The basic idea behind it, is that DNA will travel through the gel towards the positive pole and away the negative pole of the electrophoresis machine. The smaller the fragment, the further it will travel towards the positive pole, as it will go through the gel quickly. The larger fragments will travel slower towards the positive pole, and will travel less compared to the small fragments. This is how one can quickly compare size of DNA fragments, and possibly even compare between 2 or more DNA strands and find similarities.
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to see if samples contain the target DNA
to verify that no DNA has contaminated the gel
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