What does DNA band repsesent in the agarose gel electrophoresis?
Each band represents a piece of DNA. The extent to which they move through the gel has to do with the fragment’s electrophoretic mobility. The lighter the molecule in general the faster it can move through the gel. Usually when performing a gel electrophoresis one would use markers. These markers would be of known molecular weight and would allow you to compare your DNA fragments and find approximate molecular weights.
