Evolution (Juncos) Review

Genetic variation can help a species survive when the environment changes. What is the best example of an organism with genetic variation that could improve its chances to survive overtime?

• An ant that is resistant to pesticides

• A wasp that is infected with parasites

• A mouse that has learned to avoid mouse traps

• A bird losing the ability to fly

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What is required for natural selection to occur?

• Competition for unlimited resources

• Gradual warming of the Earth

• Environmental disasters

• Genetic variation in species

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An inherited characteristic that increases an organism's change of survival.

• Adaptation

• Evolution

• Fitness

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Study of embryos of various organism to show a common ancestor because of similarities in development

• Natural selection

• Embryology

• Speciation

• Evolution

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On the Galapagos islands, Charles Darwin observed

• Species completely unrelated to those found in South America

• Somewhat similar species with traits that were suited to their particular environment

• Species exactly like those found in South America

• Completely unrelated species on each of the islands

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An organisms with the "best" traits (adaptations) will live longer and reproduce more than others, causing changes in the population over time by acting on traits that are heritable.

• Evolution

• Natural Selection

• Fitness

• Variation

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Which of the following statements gives the most likely explantation for the presence of two very similar species of squirrels living on opposite sides of the Grand Canyon?

• One squirrel traveled across the canyon and started a new population on the other side.

• One squirrel traveled across the canyon and interbred with a different population on the other side.

• Members of one single squirrel species were geographically separated by the formation of the canyon.

• Members of two different species migrated from two different places to opposite sides of the canyon.

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The Asian shore crab invaded parts of the eastern coast of the United States about 15 years ago. The Asian shore crab preys on blue mussels. In the time since the Asian shore crab arrived, the average shell thickness of the blue mussel population has increased. Which of the following is the most likely reason that this increase in shell thickness has occurred?

• Blue mussels with thick shells attract more crabs than mussels without thick shells

• Blue mussels with thick shells grow in larger colonies than mussels without thick shells

• Blue mussels with thick shells catch more food per day than mussels without thick shells

• Blue mussels with thick shells survive and reproduce more successfully than muscles without thick shells.

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According to the theory of natural selection, why are some individuals more likely than others to survive and reproduce?

• Some individuals pass on to their offspring new characteristics they have acquired during their lifetimes.

• Some individuals are better adapted to exist in their environments than others are.

• Some individuals do not pass on to their offspring new characteristics they have acquired during their lifetimes.

• Some individuals tend to produce fewer offspring than others in the same environment.

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Moths are all the same species. The differences between their wings (color and shape) is an example of

• Natural selection

• Variation

• Homeostasis

• Extinction

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