Read the scenario. loretta has a sample that contains a mixture of different dna molecules. she would like to separate them by size to her determine the length of each molecule. which technique should she use?
dna barcoding
gel electrophoresis
sanger sequencing
pcr

gel electrophoresis

Explanation:

Gel electrophoresis is a technique of cell biology capable of separating molecules making them migrate from one pole of the gel, to the opposite pole through a potential difference. This technique is perfect for determining the size of the molecules, because the smaller molecules are able to migrate from one pole to the other with greater speed than the larger molecules.

With gel electrophoresis, Loretta will be able to separate DNA molecules by size, helping her to determine the length of each molecule.