Ch-23-Test-questions

Ch-23-Test-questions - Biology 8e(Campbell Chapter 23 The...

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Biology, 8e (Campbell) Chapter 23 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. 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 population's 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 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 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. 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 population's gene pool at a locus that had formerly been fixed? A) Average heterozygosity B) Nucleotide variability C) Geographic variability D) Average number of loci 6) Which of these is the smallest unit upon which natural selection directly acts? A) a species' gene frequency B) a population's gene frequency C) an individual's genome D) an individual's genotype E) an individual's phenotype 7) Which of these is the smallest unit that natural selection can change? A) a species' gene frequency B) a population's gene frequency 1
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C) an individual's genome D) an individual's genotype E) an individual's phenotype 8) Which of these evolutionary agents is most consistent at causing populations to become better suited to their environments over the course of generations? A) Mutation B) Non-random mating C) Gene flow D) Natural selection E) Genetic drift 9) Which statement about the beak size of finches on the island of Daphne Major during prolonged drought is true? A) Each bird evolved a deeper, stronger beak as the drought persisted.
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Ch-23-Test-questions - Biology 8e(Campbell Chapter 23 The...

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