| A | B |
|---|
| gene flow | The movement of alleles from one population to another. |
| speciation | The rise of two or more species from one existing species. |
| extinction | The elimination of a species from earth. |
| genetic drift | The change in allele frequencies due to chance alone. |
| gene pool | A collection of all the alleles found in all the individuals of a population |
| allele frequency | The measure of how common a certain allele is in a population. |
| normal distribution | A distribution in a population in which allele frequency is highest near the mean (middle) range and decreases toward each end. |
| behavioral isolation | The isolation between populations due to differences in courtship or mating behavior. |
| geographic isolation | The isolation between populations due to physical barriers. |
| temporal isolation | The isolation between populations due to differences in mating periods or differences in the time of day that individuals are most active. |
