Question

Why does the DNA move down the gel?

because they are small sections
because the DNA is - and they move
toward the + end
because the DNA is + and they move
toward the + end
because the DNA is - and they move
toward the - end

Answer 1

DNA fragments are negatively charged so the more for the positive electrode because all DNA fragments of the same amount of charge per mass does smart pigments move through the gel faster than large one