The movement of alleles between two populations of the same species
Process in which a large population declines in number, then rebounds
Process in which indiviuals with average traits are removed, creating two populations with extreme traits
Random change in allelic frequencies in a population (by chance)
Most common form of natural selection in which organisms with extreme expressions of the trait are removed
Shift of a population toward an extreme version of a beneficial trait
Random effect that can occur when a small population settles in an area separated from the rest of the population and interbreeds, producing unique allelic variations
Occurs when a population divided by a geographic barrier evolves into two or more populations unable to interbreed
Theory that evolution occurs in small, gradual steps over time
States that allelic frequencies in populations stay the same unless they are affected by a factor that causes change
Change in the frequency of a trait based on competition for a mate
Theory that evolution occurs with relatively sudden periods of speciation followed by long periods of stability
Diversification of a species into a number of different species, often in a relatively short time span
Occurs when a species evolves into a new species in an area without a geographic barrier
Factor that prevents a hybrid zygote from developing or prevents hybrid offspring from reproducing; operates after fertilization
Factor that prevents individuals from different species from mating; operates before fertilization
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