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Unformatted text preview: 1 PRACTICE / STUDY PROBLEMS ON MACROEVOLUTION -- SPECIATION AND PHYLOGNETICS -- Review Questions from text Selected Essay Type questions from Campbell & Reece, Biology (8th ed.) Chap 24: Concept Check: 24.1 #1,2 24.2 #2,3 24.3 #3 24.2 #2 End of Chapter: 8 (without peeking at handout from lecture!) Chap 26: Concept Check: 26.1 #2,3,4 26.2 #1,2 26.3 #3 End of Chapter: 8,9 QUESTIONS FROM PREVIOUS BIOLOGY 25 EXAMS 1. Oil content in corn kernels is a quantitative trait, varying from <2% to >8%. Assume this trait is determined by many genes (the exact number does not matter) each with two alleles, one for high oil and the other for low oil. On the graph, draw a dotted (----- ) line to show the expected phenotypic distribution in a population where seeds with low oil content failed to provide enough nutrition for seedlings to grow and seeds with high oil content were preferentially eaten by birds. 2. The graph below shows the distribution of beak sizes in a population of medium ground finches in the Galapagos. a) If the island on which they are living is subsequently successfully colonized by a different finch species from a neighboring island whose bill size ranges from 9-11 mm, predict what you would expect to happen to beak size in the medium ground finches, and why. Draw your expected result on the blank graph on the right. b) Is this event likely to result in speciation? If you say yes, explain why and how speciation would occur. If you say no, explain why not, including what condition would have to be met. 3. Duke Forest is home to two similar species of coral root orchid. One, early coral root, blooms in the spring. The other, autumn coral root, blooms in late summer and fall. a) Although the two species very closely resemble each other morphologically and both live in the same wooded habitat, why are they regarded as separate species according to the Biological Species Concept? b) If it were possible to cross-pollinate the two species artificially, would whether or not they produced viable, fertile offspring make a difference to the decision to consider them separate species? Why or why not? Why or why not?...
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