Unit III Exam-A Spr11 KEY

Unit III Exam-A Spr11 KEY - BSC 2011 Unit III Exam Form A...

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BSC 2011 Unit III Exam – Form A Spring 2011 Name, please: ____ ANSWERS AT THE END ___________ 1. Adult male humans generally have deeper voices than do adult female humans, as the direct result of higher levels of testosterone causing growth of the larynx. If the fossil records of apes and humans alike show a trend toward decreasing larynx size in adult females, and increasing larynx size in adult males, then _____. A) sexual dimorphism was developing over time in these species B) larynx size was a selectively neutral trait in these species C) selection was acting more directly upon genotype than upon phenotype D) stabilizing selection was occurring in these species concerning larynx size E) intrasexual selection occurred over time 2. Which of these can change via natural selection? A) a species' gene frequency B) a population's gene frequency C) an individual's gene frequency D) an individual's genotype E) an individual's phenotype 3. A population of boll weevils (an insect that damages cotton crops) is subjected to aerial spraying of a pesticide repeatedly throughout the growing season. Which statement about pesticide resistance in boll weevils during the growing season is true? A) Each insect evolves greater resistance during a growing season trying to survive. B) Each insect develops greater resistance during a growing season trying to survive. C) Each insect that survived produced only offspring with greater resistance than seen in the previous generation. D) Each insect’s survival is strongly influenced by how resistant it is during a growing season. E) The frequency of the resistant alleles increased in each insect during the progression of the growing season. 4. In modern terminology, diversity is understood to be a result of genetic variation. Sources of variation for evolution include all of the following except _____. A) mistakes in translation of structural genes. B) mistakes in DNA replication. C) translocations and mistakes in meiosis. D) recombination of parental alleles at fertilization. E) recombination by crossing over in meiosis. Please use the following information to answer the two following questions. An ecologist is able to correlate the darkness of leaves in a particular species of small plant with its exposure to sunlight: when plants grow on the forest floor under trees, their leaves are dark green; plants growing at the edge of the forest at the edge of the forest with intermediate levels of sunlight are moderately green; and plants growing in the open field next to the forest under maximum sunlight have leaves that are pale green. 5. This observed difference in leaf color is an example of _____. A) a cline B) a bottleneck C) relative fitness D) genetic drift E) frequency-dependent selection 6. The ecologist plants seeds produced from the forest-floor plants in the open field and she plants seeds from the open-field plants in the forest floor. After a sufficient period of growth, she observes that plants in the open-field study plot have dark leaves and plants in
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This document was uploaded on 11/03/2011 for the course BIO bsc2011 at FSU.

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Unit III Exam-A Spr11 KEY - BSC 2011 Unit III Exam Form A...

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