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Chapter 11 Vocab
Terms in this set (24)
The combined alleles of all of the individuals in a population.
Measure of how common a certain allele is in the population.
When the frequency is the highest near the mean value and decreases toward each extreme end of the range.
Observable change in the allele frequencies of a population over time.
A selection that favors phenotypes at one extreme of a trait's range.
When the intermediate phenotype is favored and becomes more common in the population.
It occurs when both extreme phenotypes are favored, while individuals with intermediate phenotypes are selected against something made by nature.
Movement of alleles from one population to another.
Changes in allele frequencies that are due to chance.
Genetic drift that occurs after an event greatly reduces the size of a population.
Genetic drift that occurs after a small number of individuals colonize a new area.
It occurs when certain traits increase about mating success.
hardy Weinberg equilibrium
Describes that populations are not evolving. It is used to predict genotype frequencies in a population. There are five factors: very large population, no emigration or immigration, no mutations, random mating, no natural selection.
It occurs when members of different populations can no longer mate successfully.
The rise of two or more species from one existing species.
Isolation caused by differences in courtship or mating behaviors.
Involves physical barriers that divide a population into two or more groups.
Exists when timing prevents reproduction between populations.
Evolution toward similar characteristics om imrelated species.
Closely related species evolve in different directions.
Process in which two or more species evolve in response to changes in each other.
The elimination of a species from Earth.
States that episodes of speciation occur suddenly in geologic time and are followed by long periods of little evolutionary change.
Diversification of one ancestral speices into many descendent speices.
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