Chapter 18 Evolution of Populations Review

Which answer best shows an animal's adaptation to the tropical rain forest?

• camouflage in a tree frog

• the long neck of a giraffe

• an elephant's long trunk

• migration of birds in winter

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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 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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How do fossils demonstrate evidence of evolution?

• they show that ancient species share similarities with species now on Eearth

• they show evidence of species that are now extinct

• they are the primary source of evidence of natural selection

• fossils reveal that many species have remained unchanged for millions of years

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Which of the following is the explanation of why bird wings and reptile forelegs are evidence of evolution?

• similar functions point to a common ancestor

• analogous structures indicate a common ancestor

• vestigial structures point to a common ancestor

• homologous structures indicated a common ancestor

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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 population diverges and becomes reproductively isolated. Which of the following is the best description of that phenomenon?

• speciation

• bottleneck

• postzygotic isolation

• sexual selection

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