1. Natural selection in populations & Other mechanisms of Evolution
11.2 & 11.3

2. Normal distribution
Frequency is highest near the middle and decreases toward each extreme end of the range

3. Directional Selection
Still generally represented as a bell curve, but there is a shift in the population’s phenotypic distribution

4. Stabilizing Selection
The intermediate phenotype is favored and becomes more common in the population

5. Disruptive selection
Both extreme phenotypes are favored, while individuals with intermediate phenotypes are selected against.

6. Other mechanisms for evolution

7. Genetic Drift
Causes loss of genetic diversity in a population

8. Sexual selection
Certain traits increase mating success