Evolution of Populations

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

• 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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In a population of birds, intermediate beak size is selected against, and both very small and very large beak sizes are favored. What type of selection is this an example of?

• directional

• disruptive

• normal

• stabilizing

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The total and permanent disappearance of a species from Earth is called

• radiation

• coevolution

• extinction

• equilibrium

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What do you call all of the genes in a population?

• Gene pool
• Relative Frequency
• Genetic Drift
• Allele pool

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A chance occurrence that negatively affects a population because the population is small.

• genetic drift
• mutation
• speciation
• migration

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