Practice_exam_1_Apr_06

Practice_exam_1_Apr_06 - Homework 1 Practice Exam 1...

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Homework 1 Practice Exam 1 Wednesday, April 06 1.) Nemoria mimosaria caterpillar on branch. Design an experiment to test the hypothesis that Nemoria caterpillars develop into the twig-like morph if they eat tannins (a molecule in oak leaves). You have a supply of tannins and artiFcial food (doesn’t contain tannins), and Nemoria eggs from the spring and summer population. State your experimental set-up, and the predictions of the “Tannins R Us” hypothesis and null hypothesis. Key: Sample answer Randomly select a large and equal number of spring and summer eggs. Raise half the larvae on the artiFcial food and half on the artiFcial food with tannins in it (same concentration as oak leaves). Raise all the caterpillars in a location where all other conditions—light, humidity, temperature, amount of food available—are identical and optimal for caterpillar development. Record what % of larvae develop into the twig-like morph. Tannins R Us predicts that all or most larvae on the + tannins diet develop into twig-like caterpillars. Null hypothesis predicts no difference between treatments (either none are twig-like or equal numbers become
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Practice_exam_1_Apr_06 - Homework 1 Practice Exam 1...

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