13 lecture feb 28 final

13 lecture feb 28 final - Speciation Theory 1. What is a...

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1 1 Speciation Theory 1. What is a species? 2. How do new species originate? 3. Testing allopatric speciation theory Science in the news “The higher the proportion of infertile “parasperm” transferred to a female fruit fly, the longer the male’s fertile sperm live within her reproductive tract.” 2 Testing Allopatric Speciation Theory If the theory is correct, then the more opportunities for geographic isolation, the more closely-related species should be found in a given area. Test: Of the 14 species of Darwin’s finches, 13 are found in the Galapagos Islands and only one occurs on Cocos Island. 3 Cocos island 4 If geographic isolation is necessary for the formation of new species, which state should have the most species of fruit flies (genus Drosophila )? A. Arizona, B. California, C. Hawaii, D. Louisiana
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2 5 24.5 6 One of 500+ Hawaiian fruit flies The Hawaiian honeycreepers 7 Which of the following “findings” would provide the strongest evidence against allopatric speciation in this make-believe case? Waklunds,
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13 lecture feb 28 final - Speciation Theory 1. What is a...

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