evolution of populations
Terms in this set (25)
collection of alleles found in all of the individuals of a population.
proportion of one allele, compared with all the alleles of that trait, in the gene pool.
distribution in a population in which allele frequency is highest near the mean range value and decreases progressively toward each extreme end.
observable change in the allele frenquencies of a population over a few generations.
pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype.
pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes.
pathway of natural selection in which two opposite, but equally uncommon, phenotypes are selected over more common phenotypes.
physical movement of alleles from one population to another.
change in allele frenquencies due to chance alone, occuring most commonly in small populations.
genetic drift that results from an event that drastically reduces the size of a population.
genetic drift that occurs after a small number of individuals colonize a new area.
selection in which certain traits enhance mating success; traits are, therefore, passed on to offspring.
condition in which a populations allele frequencies for a given trait do not change from generation to generation.
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.
evolution of two or more species from one ancestral species.
isolation between populations due to differences in courtship or mating behavior.
isolation between populations due to physical barriers.
isolation between populations due to barriers related to time, such as differences in mating periods or differences in time of day that individuals are most active.
evolution toward similar characteristics in unrelated species, resulting from adaptations to similar environmental conditions.
evolution of one or more closely related species into another species; resulting from adaptations to different environmental conditions.
process in which two or more species evolve in response to changes in each other.
elimination of a species from earth.
theory that states that speciation occurs suddenly and rapidly followed by long period of little evolutionary change.
process by which one species evolves and gives rise to many descendant species that occupy many ecological niches.
descent with modification
process by which descendants of ancestral organisms spread into various habitats and accumulate adaptations to diverse ways of life