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

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

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic