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Causes of Evolution 2. Genetic Drift

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Presentation on theme: "Causes of Evolution 2. Genetic Drift"— Presentation transcript:

1 Causes of Evolution 2. Genetic Drift
Founder effect - when a new population is a small sample of a large population King George III Example: Porphyria 1 / 80,000 1 / 8,000

2 Causes of Evolution 2. Genetic Drift
Before crash RARE Bottleneck effect - when only a small fraction of the population survives that is no longer representative Example: Lions living in the Ngorogoro Number of lions 100 50

3 Causes of Evolution 2. Genetic Drift
Bottleneck effect - when only a small fraction of the population survives that is no longer representative Example: Lions living in the Ngorogoro 100 After crash Number of lions 50 COMMON


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