Natural Selection Vocab Review

Natural Selection Vocab ReviewChange through time.EvolutionPhysical evidence of past organisms changing through time, left in rocks.Fossil RecordHomologous Structures

All the alleles which are possible in a populations genes that could be passed on.Gene poolFavors ONE of the extremes.Directional selectionGeographic Isolation

Species originate through a gradual change of adaptations.GradualismMechanism for change in a population for individuals to survive.Natural selectionAdaptation

Evolution of new species from one common ancestor that results in multiple new species whom can not interbreed.SpeciationPhysical barrier divides a population, creating different populations which evolve separately and can not interbreed.Geographic IsolationNatural Selection

Favors BOTH extremes in a population, eliminating the average.Disruptive selectionThe frequency of alleles in a population remains the same over many generations.Genetic equilibriumVestigial structure

Evolution that distinctly related organisms evolve similar traits when they live in similar environments.Convergent evolutionPopulations can no longer interbreed due to differences in genetic material.Reproductive isolationPunctuated Equilibrium

Structure with similar function and arrangement with a common origin.Homologous structureFavors the AVERAGE in a population, resulting in less variation.Stabilizing selectionAn organisms response to or change with its environment.AdaptationAnalogous Structures

A single ancestral species evolves into a wide array of species to fit different habitats.Adaptive radiationStructure in present day organism that is not useful, but was in an ancestor.Vestigial structureDirectional Selection

Transport of genes into a population by migrating individuals.Gene flowStructures that are similar in function but have no common origin.Analogous structurePopulations can no longer interbreed due to differences in mating behaviors.Behavioral isolationSpecies that were once similar to ancestral species change in different ways as they adapt, creating new species.Divergent evolutionSpeciationOr Divergent Evolution

The percentage of any specific allele occurring in a population.Allelic frequencySpecies can occur relatively quickly with periods of genetic equilibrium in between them.Punctuated equilibriumStabilizing Selection

Evolution of a trait enabling an organism to respond to environmental factors.AdaptationGradualism

Natural selection that favors one of the extreme variations of a trait.Directional selectionSome male frogs of the same species, changed their mating call, causing them to become a different species over time, by attracting different femalesBehavioral Isolation

A population is divided due to a change in particular behaviors.Behavioral isolationDisruptive Selection