Bio Unit 4 Quizzes

Bio Unit 4 Quizzes - 1. Evolution can be defined as:...

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1. Evolution can be defined as: Correct Answer: A change in the gene pool of a population 2. Which of the following statements about evolution and natural selection is true? Correct Answer: Natural selection acts directly on phenotype, but populations evolve. 3. Microevolution can best be defined as a change in: Correct Answer: The allele frequency within a population 4. If a population were to undergo no evolution, which of the following statements about that population would have to be true? Your Answer: Survival must be random. 5. Which of the following statements about mutations is false? Correct Answer: They are the only force in evolution that consistently adapts organisms to their environment.
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6. The best explanation of the disadvantage of inbreeding is that it: Your Answer: More than one, but not all, of these choices 7. Unlike the other mechanisms that can cause microevolution, natural selection always works in concert with ______ to make organisms more fit. Correct Answer: The environment 8. In sexual selection, mate choice is based solely on an individual's: Correct Answer: Phenotype 9. Allele change due to genetic drift is based solely on: Correct Answer: Chance events 10. On a remote Pacific island, a certain species of hare has very short, reduced ears. During a storm, a package containing live, domesticated rabbits is washed over the side of a ship and eventually washed onto the shore of the island. Within only a few generations, the population of hares has changed so that 50% of the hares have short ears and 50% have long ears. This is an example of microevolution through: Your Answer: Gene flow (migration)
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A species of green sunfish lives along the length of a river. In order to provide electricity to area homes, a hydroelectric dam is built to separate the lower river area from a newly formed lake above. After many, many years, the green sunfish in the river and the lake are sampled and found to be very different phenotypically. Which of the following scenarios is the best hypothesis to explain the changes observed? Correct Answer: The dam caused different environmental conditions to be formed in the lake and the river, and natural selection selected for the best-fit organisms in both environments. 13. According to the evolutionary definition of fitness, which of these organisms is the "fittest" at this current moment in time? Correct Answer: A female humpback whale that has had four calves, but is now at the end of her life 14. Which of the following statements about adaptations is true? Your Answer: A genetically caused change in an individual's phenotype may or may not be an adaptation depending upon the environment. 16. Which of the following statements about stabilizing selection is true? Correct Answer:
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Bio Unit 4 Quizzes - 1. Evolution can be defined as:...

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