Figure 76 from Your Text,shown Below,is a Set of Histograms Showing

question 28

Multiple Choice

Figure 7.6 from your text,shown below,is a set of histograms showing the frequency of different color patterns of water snakes of Lake Erie (Nerodia sipedon) .Type A snakes are unbanded,Type B are strongly banded,and Types C and D are intermediates.Given that natural selection favors unbanded snakes on the islands,how can you account for the presence/perpetuation of banded snakes on the islands?

• A) Mutation rates converting unbanded alleles to a banded form operate at high frequencies on islands.
• B) Natural selection favors unbanded snakes on the mainland.
• C) Snakes on the islands represent a case of the so-called founder effect.
• D) Natural selection favors banded snakes on the mainland, which occasionally migrate to the islands.