Biology › Section J · Evolution › Topic J.6
Adaptive evolution
Natural selection shapes heritable variation in five recognisable ways, from keeping the average to pushing one extreme or both. Fitness, not strength, decides who wins.
In this topic
- What adaptive evolution is
- Selection acts on organisms, not alleles
- Worked example: Calculating relative fitness
- Stabilizing selection
- Directional selection
- Diversifying selection
- Worked example: Reading a shifted distribution
- Frequency-dependent selection
- Sexual selection
- Why females choose costly ornaments
- Common mistakes to avoid
- Key takeaways
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