Mechanisms for 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
• Natural Selection
• Non-random mating
• Mutation

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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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During gestation (pregnancy), a developing male pig had a change in his genetic code. The result was that he to produce less nitrogenous solid waste.

• 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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NGSS.HS-LS3-2

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Wolves from the Arizona mesa were transferred to the Colorado Rockies after a forest fire destroyed their habitat. They quickly became part of the local pack and had offspring.

• Mutation
• Natural Selection
• Genetic Drift
• Gene Flow

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7 Wild Mustangs were taken from the prairies of Iowa after a Texan Rancher purchased them and provided them with their own pasture. Those 7 Mustangs eventually became 122.

• Genetic Drift (small popultaion)
• Non-random mating
• Gene flow
• Mutations

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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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All of the genetic information found in a population.

• population

• genetic drift

• evolution

• gene pool

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Gene Flow tends to ___________ genetic variation (diversity)

• Increase
• Decrease
• Stabilize
• Exaggerate 

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

• Cheetah populations reach their lowest levels with reduced diversity and as they rebound are so genetically similar they appear to be inbred.
• Affected individuals with blue skin can trace their ancestry back to one of the first settlers in the region.
• The environment of a fox population changes and over time foxes who are white survive and pass on their genes to their offspring.
• Humans choose two dogs they like the characteristics of and breed them together.