Biology › Section J · Evolution › Topic J.4
Population evolution: drift and gene flow
Evolution is a shift in allele frequencies. Two forces can drive that shift with no regard for fitness — the lottery of genetic drift and the traffic of gene flow.
In this topic
- Mendel meets Darwin: the modern synthesis
- Evolution means changing allele frequencies
- Worked example: computing allele frequencies
- Genetic drift: evolution by lottery
- Why small populations feel chance the most
- The bottleneck effect
- The founder effect
- Worked example: island vs mainland under a disease
- Gene flow: alleles on the move
- Clines: gene flow written across a landscape
- Common mistakes to avoid
- Key takeaways
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