Collection of alleles found in all of the individuals of a population.

Proportion of one allele, compared with all the alleles for that trait, in the gene pool.

Distribution in a population in which allele frequency is highest near the mean range value and decreases progressively towards each extreme end.

Observable change in the allele frequencies of a population over a few generations.

Directional Selection

Pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype.

Stabilizing Selection

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 common, 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.

Selection in which certain traits enhance mating success; traits are, therefore, passed on to offspring.

Hardy Weinberg Equilibrium

Condition in which a population's allele frequencies for a given trait do not change from generation to generation.

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.

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.

Punctuated Equilibrium

Theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change.

Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches.

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Biology Vocab

Chapter 11

Term	Definition
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 decreases progressively towards each extreme end.
Microevolution	Observable change in the allele frequencies of a population over a few generations.
Directional Selection	Pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype.
Stabilizing Selection	Pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes.
Disruptive Selection	Pathway of natural selection in which two opposite, but equally common, phenotypes are selected over the most common phenotype.
Gene Flow	Physical movement of alleles from one population to another.
Genetic Drift	Change in allele frequencies due to chance alone, occurring most commonly in small populations.
Bottleneck Effect	Genetic drift that results from an event that drastically reduces the size of a population.
Founder Effect	Genetic drift that occurs after a small number of individuals colonize a new area.
Sexual Selection	Selection in which certain traits enhance mating success; traits are, therefore, passed on to offspring.
Hardy Weinberg Equilibrium	Condition in which a population's allele frequencies for a given trait do not change from generation to generation.
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	Evolution toward similar characteristics in unrelated 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.
Extinction	Elimination of a species from Earth.
Punctuated Equilibrium	Theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change.
Adaptive Radiation	Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches.

Created by: 58knasims

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