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.
D
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