Biology Vocabulary: Ch. 11 The Evolution of Populations
Terms in this set (21)
Collection of alleles found in all of the alleles of a population.
Proportion of one allele, compared with all the alleles for that trait, in the gene pool.
Observable change in the allele frequencies 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 the most common phenotype.
Physical movement of alleles from one population to another.
Change in allele frequencies due to chance alone, occurring 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.
Final stage of speciation, in which organisms 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 the 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 different 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 periods of little evolutionary change.
Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches.