Mechanisms of Evolution

• gene flow

• natural selection

• bottleneck effect

• founder effect

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Thanks to a better food source, giraffes with longer necks were able to survive to reproduce and so passed on the characteristic to the succeeding generation.

• gene flow

• natural selection

• bottleneck effect

• founder effect

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Northern elephant seals have reduced genetic variation because of humans hunting them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century.

• Gene flow

• natural selection

• bottleneck effect

• founder effect.

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Which of the following statements about gene flow is TRUE?

• Gene flow is a result of individuals that breed in an old location

• Gene flow is a result of migrating individuals that breed in a new location

• Gene flow is not a result of migrating individuals that breed in a new location

• None of the statements are true

In order for the genetic drift to occur, what is the necessary parameter?

• The population must be large.

• The population must be small.

• The population must be under environmental stress.

• The population must be sterile.

What will happen to the organisms during natural selection?

• Organisms tend to remain the same

• Organisms tend to adapt the changes

• Organisms tend to ignore the changes

• None of the statement is correct

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What should fittest individual must do in order for the evolution to occur?

• Avoid predators more successfully

• Be better at obtaining food

• Leave more offspring

• Must be sterile

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Reindeer from a rancher in Alaska escape from their pen during an enormous snow storm. After their escape, they mate with wild caribou that are migrating across the land. The offspring of these have traits for short legs and have tame behavior.

• Gene Flow

• Genetic Drift

• Non-Random Mating

• Natural Selection

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Insects become resistant to pesticides very quickly, sometime in one generation. If an insect is resistant to the chemical, most of the offspring will also be resistant. Considering that insect generations can be a matter of weeks, insects in an area can become immune to a chemical within months.

• Mutation

• Natural Selection

• Genetic Drift

• Gene Flow

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In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs

• Genetic Drift

• Natural Selection

• Gene Flow

• Mutation

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