If the Groups We Recognize as Different Human Races Represented

If the groups we recognize as different human races represented populations that have been genetically isolated for a long time, we would expect to see:

A) high levels of genetic variation between groups relative to what we see within groups.
B) high levels of genetic variation within groups relative to what we see between groups.
C) no clear pattern of genetic variation-in some regions, we would see more variation within than among groups, and in some regions we would see the opposite.
D) a correlation between the amount of genetic variation between groups and the length of time the groups have been isolated from one another.
E) None of the answer options is correct.