What is the purpose of the gel in electrophoresis?

Seperates molecules on the basis of their charge and size

to separate the proteins, apparently.

To separate a mixture of DNA fragments from eachother

to act as a sieve, slowing down the movement of larger particles as they migrate through the gel.

First of all the function of the gel electrophoresis is to separate lengths of DNA samples by using different charges. The function of the gel is to allow the DNA fragments to travel downward so we...