Question

electrophoresis separates dna fragments by which force?
size and charge of the dna
shape and color of the dna
dna is not separated in the electrophoresis method
size and charge of the gel used in the electrophoresis
i do not know

Explanation:

DNA has a negative charge due to its phosphate groups. In electrophoresis, an electric field is applied. The negatively - charged DNA fragments move towards the positive electrode. Smaller DNA fragments move faster through the gel matrix (because they encounter less resistance) and larger ones move slower. So, the separation is based on the size (affecting movement through the gel) and charge (causing movement in the electric field) of the DNA.

Answer:

Size and charge of the DNA