HS.Bio.13 Speciation and Population Genetics

Gene Pool

the collections of alleles within a population

Allele Frequency

how often an allele is present in a population

Stabilizing Selection

natural selection that favors the average type of individual

Disruptive Selection

natural selection that favors the two extremes of a population

Directional Selection

natural selection that favors individuals in one direction or another in a population

Genetic Equilibrium

when the allele frequency does not change between generations

Speciation

process by which a new species formed

Isolation

when two groups of organisms are prevented from reproducing for a variety of reasons. Examples include reproductive, temporal, geographic, and behavioral isolation.

Extinction

dying out or extermination of an entire species

Nonrandom Mating

mate selection is influenced by phenotypic differences based on underlying genotypic differences