| A | B |
|---|
| gene pool | collection of alleles found in all of the individuals of a population |
| allele frequency | proportion of one allele, compared with all the alleles for that trait, in the gene pool. |
| normal distribution | distribution in a population in which allele frequency is highest near the mean range value and decreses progressively toward each extreme end. |
| microevolution | observable change in the allele frequencies of a population over a few generations |
| reproductive isolation | final stage in speciation, in which members of isolated populations are either no longer able to mate or no longer able to produce viable offspring. |
| speciation | evolution of two or more species from one ancestral species |
| behavioral isolation | isolation between populations due to differences in courtship or mating behavior |
| geographic isolation | isolation between populations due to physical barriers |
| temporal isolation | isolation between populations due to barriers related to time, such as differences in mating periods or differences in the time of day that individuals are most active. |
| convergent evolution | evloution toward similar characteristics in nrelated species, resulting from adaptations to similar environmental conditions |
| divergent evolution | evolution of one or more closely related species into different species; resulting from adaptations to different environmental conditions |
| coevolution | process in which two or more species evolve in response to changes in each other |
