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Unformatted text preview: 23 Chapter The Evolution of Populations Multiple-Choice Questions 1) Which of these is a statement that Darwin would have rejected? A) Environmental change plays a role in evolution. B) The smallest entity that can evolve is an individual organism. C) Individuals can acquire new characteristics as they respond to new environments or situations. D) Inherited variation in a population is a necessary precondition for natural selection to operate. E) Natural populations tend to produce more offspring than the environment can support. Answer: B Topic: Concept 23.1 Skill: Knowledge/Comprehension 2) Which definition of evolution would have been most foreign to Charles Darwin during his lifetime? A) change in gene frequency in gene pools B) descent with modification C) the gradual change of a populations heritable traits over generations D) populations becoming better adapted to their environments over the course of generations E) the appearance of new varieties and new species with the passage of time Answer: A Topic: Concept 23.1 Skill: Knowledge/Comprehension 3) About which of these did Darwin have a poor understanding? A) that individuals in a population exhibit a good deal of variation B) that much of the variation between individuals in a population is inherited C) the factors that cause individuals in populations to struggle for survival D) the sources of genetic variations among individuals E) how a beneficial trait becomes more common in a population over the course of generations Answer: D Topic: Concept 23.1 Skill: Knowledge/Comprehension 4) If, on average, 46% of the loci in a species gene pool are heterozygous, then the average homozygosity of the species should be A) 23% B) 46% C) 54% D) 92% E) There is not enough information to say. Answer: C Topic: Concept 23.1 Skill: Knowledge/Comprehension 5) Which of these variables is likely to undergo the largest change in value as the result of a mutation that introduces a brand-new allele into a populations gene pool at a locus that had formerly been fixed? A) Average heterozygosity B) Nucleotide variability C) Geographic variability D) Average number of loci Answer: A Topic: Concept 23.1 Skill: Knowledge/Comprehension Page 1 6) Which of these is the smallest unit upon which natural selection directly acts? A) a species gene frequency B) a populations gene frequency C) an individuals genome D) an individuals genotype E) an individuals phenotype Answer: E Topic: Concept 23.1 Skill: Knowledge/Comprehension 7) Which of these is the smallest unit that natural selection can change? A) a species gene frequency B) a populations gene frequency selection can change?...
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