GEL ELECTROPHORESIS
Gel Electrophoresis is a way to sort and measure the DNA strands. Scientists use gel electrophoresis whenever they need to sort DNA strands according to lengths. This technique is also useful for separating other types of molecules, like proteins.
The "gel" is the filter that sorts the DNA strands. It is like a sponge made of gel with many holes in it.
The DNA samples are placed into holes at one end of the gel.
Electrophoresis is how we push the DNA strands through the gel filter. By adding an electrical current, we can make the DNA move.