Mechanisms of Evolution

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 meiosis (sperm formation), a developing male pig had a change in his DNA that resulted in his coat becoming spotted.

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

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

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

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7 wild mustangs were taken from the prairies of Oklahoma after a Texas rancher purchased them and provided them with their own pasture. Those 7 mustangs eventually reproduced to have 122 offspring.

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

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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.

• Adaptation
• Non-random mating
• Gene Flow
• Mutation

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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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What does the image represent?

• Founder effect
• Bottleneck effect
• Natural Selection
• Mutations

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Which of the following must occur for speciation to happen?

• gene flow
• reproductive isolation
• genetic drift
• bottleneck effect

The lava released by a volcanic eruption separates two populations of a species of monkey. What does this represent?

• biological isolation
• geographical isolation
• temporal isolation
• anatomical isolation

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Which of the following is an example of reproductive isolation?

• two populations of finches that cannot produce viable offspring
• two populations of finches that have different feather colors
• two populations of salamanders that live in different lakes
• two populations of salamanders that have different tail lengths

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