Describe how evolution can be thought of as both a fact and a theory.

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Gene flow is the movement of alleles between populations.

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Presentation transcript:

Describe how evolution can be thought of as both a fact and a theory. WARM UP Describe how evolution can be thought of as both a fact and a theory.

Gene Flow and Genetic Drift

Population Microevolution Individuals don’t evolve, populations do Small changes in gene frequency Can occur through gene flow or genetic drift

Gene Flow Migration can quickly change gene/trait frequency Especially in smaller populations

Genetic Drift Random chance can cause some genes/traits to disappear Especially in small populations

Genetic Drift Bottleneck Severe drop in population Leaves a small sample of traits (good or bad) Inbreeding

Genetic Drift Bottleneck

Genetic Drift Founder effect A migratory bottleneck A few organisms start a new population Inbreeding

WRAP UP Compare and contrast gene flow and genetic drift.

WARM UP Explain how the terms microevolution and population evolution are related.

WRAP UP Compare and contrast bottlenecks and the founder effect.