The Two Graphs Show the Change in Allele Frequency, P

Multiple Choice

The two graphs show the change in allele frequency, p, over 100 generations. Each graph shows 10 different populations, all experiencing the same evolutionary forces. What is the most likely difference between the populations shown in the top graph compared to the populations in the bottom graph?

A) There is no difference between the populations; the differences in the graphs are due to chance.
B) The populations in the graph on top have a longer generation time than the populations in the bottom graph.
C) The populations in the graph on top are experiencing genetic drift; the populations in the graph on bottom are experiencing directional selection.
D) The population sizes in the graph on top are smaller than the population sizes in the graph on the bottom.