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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.

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Presentation on theme: "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."— 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 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 Before crash RARE

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 Number of lions After crash COMMON


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