During the process of gel electrophoresis, fragments of negatively charged DNA are placed in wells at the negative end of the gel bed. The fragments of DNA are
then pulled toward the positive end of the bed. Why do some DNA fragments
travel farther than others?

Adaptive radiations can be a direct consequence of four of the following five factors. selectthe exception. a) vacant ecological niches b) genetic drift c) colonization of an isolated region that contains suitable habitat and few competitor species d) evolutionary innovation e) an adaptive radiation in a group of organisms (such as plants) that another group uses as food