Natural Selection and Population Genetics

What limits a population's ability to adapt to changing conditions?

Genetic/phenotypic diversity

Existing structures

Why should allele frequencies change in populations over time?

Hardy – Weinberg equilibrium

1. no gene flow

2. no mutations

3. random mating

4. all genotypes have same RS

5. population large enough for the "laws of probability" to apply

Evolution occurs because these conditions seldom, if ever, hold true