Mechanisms of Evolution Extension

Organisms better adapted to their environment tend to survive and produce more offspring. Their genetic profile becomes more common in the population over time.

• Gene Flow

• Natural Selection

• Bottleneck effect

• Founder Effect

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Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington's Disease, because the Dutch colonists happened to carry that gene with unusually high frequency.

• Gene flow

• Natural Selection

• Bottleneck Effect

• Founder Effect.

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.

• gene flow

• natural selection

• bottleneck effect

• founder effect

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• gene flow

• natural selection

• bottleneck effect

• founder effect

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• Gene flow

• natural selection

• bottleneck effect

• founder effect

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• 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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A bee carrying pollen from one flower population to another flower population.

• gene flow

• natural selection

• bottleneck effect

• founder effect

• gene flow

• natural selection

• bottleneck effect

• founder effect

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