Unit 3.1 Mechanisms of Evolution

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 (founder effect)

• Natural Selection
• Genetic Drift (bottleneck effect)

• Mutation

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During gestation (pregnancy), a developing male pig had a change in his genetic code. The result was that he was able to walk and do karate.

• Genetic Drift
• Non-random mating
• Mutation
• Natural Selection

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Five hundred years after the deer had established a flourishing population in the park, a few of them venture back to their original woods and have babies with the deer there.

• Genetic Drift
• Mutations
• Non-random mating
• Gene flow

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Logan was born with unique abilities for quick healing and awesome claws that stick out of his fingers.

• Gene flow
• Natural Selection
• Mutation
• Genetic Drift

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What does the image represent?

• Founder effect
• Bottleneck effect
• Natural Selection
• Mutations

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Which organisms are most likely to survive?

• the best adapted
• the fastest
• the strongest
• the most domesticated (tamed)

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Gene Flow tends to ___________ genetic variation (diversity)

• Increase
• Decrease
• Stabilize
• Exaggerate 

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Which of the following is NOT an example of natural selection? 

• People selectively breeding hamsters.
• Insect populations developing resistance to certain pesticides.
• Bacteria becoming resistant to antibiotics.
• Male birds of certain species developing colorful feathers to attract female mates.

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Bats are common in Texas, especially in rocky regions. Bats with longer hang claws have demonstrated higher fitness because of their ability to cling to rock while resting. This adaptation is becoming more frequent in the population. What mechanism of evolution is this?

• Natural Selection

• Non-random mating

• Gene Flow

• Genetic Drift

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A physical trait favored by an environmental change can be called an

• adaptation

• extinction

• possibility

• mutation

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