Intro Bio 151 Discussion Homework – Week of April 28 to May 2, 2008 PRINT OUT YOUR ANSWERS AND BRING THEM TO DISCUSSION TO HAND IN. Your TAs will give you credit for completeness of answers. In discussion we will deal with any questions you have about these before going on to another exercise. 1. The Galápagos Archipelago consists of a dozen islands all within 64 km of their nearest neighbor. From 1 to 11 of the 13 species of Darwin’s finches live on each island. Many evolutionary biologists believe that if there had been only one island, there would be only one species of finch. This view is supported by the fact that Cocos Island is isolated (by several hundred kilometers of open ocean) from the other islands in the archipelago and only one species of finch is found there. a. How does the existence of an archipelago promote speciation? Explain or provide an example. b. Is the mode of speciation that occurred on these islands more likely to have been allopatric or sympatric? Explain.
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This note was uploaded on 07/13/2008 for the course BIO 151 taught by Professor Grinblat during the Spring '08 term at University of Wisconsin.