Unit 7 AP Biology

According to fossil records, the horses that lived 50 million years ago were much smaller, weaker and slower than modern horses. Which process is most likely responsible for the changes that have led to the increased size, strength, and speed in horses?

• commensalism

• inbreeding

• migration

• evolution by natural selection

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When individuals from two different populations of the same type of species mix with each other

• genetic stirring

• mutation

• genetic drift

• gene flow

Yellow toucan birds seek out one another to make babies together and tend to avoid the green toucan birds.

• Genetic Drift

• Non-random mating

• Gene flow

• Mutation

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A few deer wander out of their native woods into a completely new park where no deer had ever been before. They go on to create an entirely new population.

• Genetic Drift

• Natural Selection

• Non-random mating

• Mutation

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Which of the following is an example of the bottle neck effect?

• Bald Eagles are hunted until near extinction, population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year. This results in larger apples from year to year.

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Which of the following is an example of the founder effect?

• Bald Eagles are hunted until near extinction, population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year.  This results in larger apples from year to year.

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Which of the following is an example of natural selection?

• Bald Eagles are hunted until near extinction, population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year. This results in larger apples from year to year.

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How do fossils provide evidence that evolution has happened on Earth?

• Fossils show how the sizes of certain animals has changed drastically over millions of years

• Fossils show that some species have gone extinct

• Fossils show how life forms present today are different than those from the past

• Different sedimentary rock layers provide evidence for how the environment has changed over time

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What happens when species produce too many offspring?

• Species share the limited resources 

• Species eat less so that all can survive

• Only those that are least fit can survive

• Only those that are best fit can survive

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A feature that allows an organism to better survive its environment

• Variation

• Natural Selection

• Adaptation

• Fitness

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