Modern Evolution

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

• allele frequency
• adaptive radiation
• temporal isolation
• sympatric speciation

Speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow.

• allopatric speciation
• allele frequency
• adaptive radiation
• temporal isolation

Isolation between populations due to differences in courtship or mating behaviors.

• behavioral isolation
• allopatric speciation
• allele frequency
• adaptive radiation

Genetic drift that results from an event that drastically reduces the size of a population.

• bottleneck effect
• behavioral isolation
• allopatric speciation
• allele frequency

The process in which two or more species evolve in response to changes in each other.

• coevolution
• bottleneck effect
• behavioral isolation
• allopatric speciation

The process whereby organisms not closely related, independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

• convergent evolution
• coevolution
• bottleneck effect
• behavioral isolation

A mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one direction.

• directional selection
• convergent evolution
• coevolution
• bottleneck effect

A mode of natural selection in which extreme values for a trait are favored over intermediate values.

• disruptive selection
• directional selection
• convergent evolution
• coevolution

Evolution of one or more closely related species into different species, resulting from adaptations to different environmental conditions.

• divergent evolution
• disruptive selection
• directional selection
• convergent evolution

The elimination of a species.

• extinction
• divergent evolution
• disruptive selection
• directional selection