Ch. 23 The Evolution of Populations

Which combination of characteristics in a population would provide the greatest potential for evolutionary chage?

• small populations, few mutations

• small populations, many mutations

• large populations, few mutations

• large populations, many mutations,

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When investigating shell color of a species of snail found only in a remote area seldom visited by humans, scientists discovered the distribution of individuals that is shown in the graph in Figure 11.1. Based on the information shown in the graph, what form of selection is the snail population undergoing?

• stabilizing selection

• disruptive selection

• artificial selection

• directional selection

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Which term best describes the structures shown in Figure 11-2?

• homologous

• heterologous

• analogous

• vestigial

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Which type of natural selection shown in Figure 11-3 favors average individuals?

• A

• B

• C

• D

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Which type of natural selection shown in Figure 11-3 would favor giraffes that need to reach the tallest branches to eat?

• A

• B

• C

• D

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Which of the following is a correct statement about the relationship between natural selection and evolution?

• natural selection results from evolution

• natural selection includes evolution as a part of it

• natural selection is one mechanism of evolution

• natural selection and evolution are the same thing

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When allelic frequencies remain unchanged, a population is in genetic equilibrium. This statement expresses which of the following?

• genetic drift

• Hardy-Weinberg principle

• sympatric speciation

• prezygotic isolating mechanism

A measure of how commonly a particular allele occurs in a population is known as the

• gene pool

• allele frequency

• mutation rate

• phenotype

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Genetic variation can arise from a random change in the DNA of a gene. This change is called a(n)

• mutation

• gene flow

• gene pool

• allele

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What is the observable change in the allele frequencies of a population over time called?

• selection

• microevolution

• distribution

• recombination

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