BIOL 121 (2012) Spring Exam 3 + Key

4 pts frequency dependent selection d the allele

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Unformatted text preview: ionarily relevant. (4 pts) A. B. C. D. E. overall phenotypic similarity shared primitive characters shared derived characters homoplasious characters analogous primitive characters 4 BIOL 121 Exam 3 4/23/12 NAME: SHORT ANSWER QUESTIONS ONLY A FEW SENTENCES – AT MOST – ARE NEEDED FOR A COMPLETE ANSWER Please enter your answers in the space provided. 10) Name the model of natural selection that best explains the following data for each scenario listed below. A) Homozygous individuals are consistently less frequent than expected (over several generations) given the Hardy- Weinberg model. (4 pts) Heterozygote advantage B) A mutation causing the smooth phenotype increases in frequency nearly every generation and eventually replaces the wrinkly phenotype. (4 pts) Directional selection C) The allele causing the smooth phenotype increases in frequency nearly every generation until it is more common than the wrinkly phen...
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