| A | B |
|---|
| gene pool | all of the genes of the reproductively active members of a population |
| bell curve | on a graph of the frequency of some variable, a curve that first rises and then falls and thus forms a symmetric bell-shaped curve |
| population genetics | the study of the frequency and interaction of alleles and genes in populations |
| microevolution | a change in the collective genetic material of a population |
| Hardy Weinberg Principle | the principle that states that the frequency of alleles in a population does not change over generations unless outside forces act on the population |
| Phenotypic Frequency | the ratio of individuals with a particular phenotype to the total number of individuals in a population |
| Mutation | results from flawed copes of individual genes |
| Gene Flow | movement of alleles into or out of a population because of migration |
| Genetic Drift | genes are changed by random events or chance; small populations are most likely to lose their genetic differences |
| Allopatric Speciation | new species develop because the species is separated |
| Prezygotic Isolation | form of reproductive isolation; before fertilization |
| Postzygotic Isolation | form of reproductive isolation; after fertilization |
| Gradualism | evolution happens at a gradual (nice and steady, continuous, constant) rate |
| Punctuated Equilibrium | evolution happens at an irregular rate |
