Natural selection acts (through predation) against banded water snakes on certain Lake Erie islands, favoring the uniformly light-colored snakes. The banded form is very common on the nearby mainlands. Yet banded snakes are maintained in the island populations and not eliminated completely. This is probably due to _________.

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    genetic drift
    gene flow
    mutation
    natural selection

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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gene flow
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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