Evolution Bonus Review

What are homologous structures?

• similar in function but different in structure
• remnants of organs that that functioned in earlier ancestors
• episodes of speciation
• similar in structure but different in function

True or False: Natural Selection acts on existing variation

• False
• True

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Which of the following explains how natural selection causes a trait to become predominant in a population?

• Individuals with traits that are favorable to the environment reproduce more.
• Traits of an individual change in order to adapt to changes in enviornment.
• organisms select which traits they wish to inherit
• all of these answers

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Intermediate fossil forms are important evidence of evolution because they show

• how organisms change over time
• how animals behaved in their environments
• how the embryos of organisms develop
• molecular homologies

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Whales are aquatic mammals that contain a pelvis bone.  Even though it does not aid in its movement, the function must have been used by a common ancestor of the whale.  Thus, the pelvis is referred to as a(n)

• vestigial structure
• analogous structure
• homologous structure

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Which process produced the two different types of beaks in the ground finch and the tree finch?

• artificial selection
• geographical distribution
• adaptive radiation
• disuse of the beak

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Process in which certain organisms are chosen by humans based on their traits to produce offspring with the desirable traits

• Selection
• Artificial selection
• Natural selection
• Evolution

Favors the middle of the population.

• Disruptive selection
• Stabilizing selection
• Directional selection

Middle is wiped out, extremes survive.
Red is previous, blue represents the change.

• Stabilizing selection
• Disruptive selection
• Directional selection

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The entire curve moves in one direction or the other. Red is previous, blue represents the change.

• Stabilizing selection
• Disruptive selection
• Directional selection

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