Definition
Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when branching or splitting occurs, leading to two or more lineages and resulting in separate species. Anagenesis does not always lead to the formation of a new species from an ancestral species. When speciation does occur as different lineages branch off and cease to interbreed, a core group may continue to be defined as the original species. The evolution of this group, without extinction or species selection, is anagenesis.
Related concepts
AbiogenesisAdaptationAdaptive radiationAllopatric speciationAlternatives to Darwinian evolutionAltruism (biology)AnisogamyAntagonistic pleiotropy hypothesisAnthropoceneAptian extinctionAstrobiologyAustralopithecus anamensisBackground extinction rateBaldwin effectBiodiversityBiogeographyBiological life cycleBiological processBlending inheritanceCambrian–Ordovician extinction eventCanalisation (genetics)CanidaeCarboniferous rainforest collapseCarnian pluvial episodeCat gapCatagenesis (biology)CatastrophismCell nucleusCenomanian-Turonian boundary eventCharles DarwinCheating (biology)ChromosomeChronospeciesCladisticsCladogenesisClimate variability and changeCoevolutionCoextinctionCommon descentConvergent evolutionCooperation (evolution)CospeciationCretaceous–Paleogene extinction eventCultural evolutionCultural group selectionDarwinismDavid HumeDe-extinctionDeathDecline in amphibian populationsDecline in insect populationsDeep timeDialogues Concerning Natural ReligionDinosaurDivergent evolutionDomestication of the dogDresbachianDual inheritance theoryEarliest known life formsEcological extinctionEcological geneticsEcological speciationEmeishan TrapsEmpathyEnd-Botomian mass extinctionEnd-Ediacaran extinctionEndlingEndomembrane systemEocene–Oligocene extinction eventEukaryoteEvidence of common descentEvolutionEvolution of MacropodidaeEvolution of ageingEvolution of bacteriaEvolution of biological complexityEvolution of birdsEvolution of brachiopodsEvolution of butterfliesEvolution of cellsEvolution of cephalopodsEvolution of cetaceansEvolution of color visionEvolution of color vision in primatesEvolution of emotionEvolution of eusocialityEvolution of fishEvolution of flagellaEvolution of fungiEvolution of insectsEvolution of lemursEvolution of mammalian auditory ossiclesEvolution of mammalsEvolution of molluscsEvolution of moralityEvolution of nervous systemsEvolution of primatesEvolution of reptilesEvolution of sexual reproductionEvolution of sireniansEvolution of snake venomEvolution of spidersEvolution of tetrapodsEvolution of the brainEvolution of the eyeEvolution of the horseEvolution of the wolfEvolutionarily stable strategyEvolutionary arms raceEvolutionary biologyEvolutionary developmental biologyEvolutionary ethicsEvolutionary gradeEvolutionary history of plantsEvolutionary ideas of the Scientific Revolution and EnlightenmentEvolutionary invasion analysisEvolutionary medicineEvolutionary mismatchEvolutionary pressureEvolutionary taxonomyEvolutionary tradeoffExaptationExtended evolutionary synthesisExtinct in the wildExtinctionExtinction RebellionExtinction debtExtinction eventExtinction risk from climate changeExtinction symbolExtinction thresholdExtinction vortexField of bulletsFisher's principleFitness (biology)Functional extinctionGene-centered view of evolutionGene flowGenetic assimilationGenetic driftGenetic erosionGenetic materialGenetic pollutionGenetic recombinationGenetic variationGenomeGolden toadGreat Oxidation EventGroup selectionHabitat destructionHairHandicap principleHistory of evolutionary thoughtHistory of lifeHistory of molecular evolutionHistory of paleontologyHolocene extinctionHologenome theory of evolutionHomininHomology (biology)Human evolutionHuman extinctionHuman impact on the environmentHybrid (biology)Hybrid speciationHyenaHypothetical speciesIUCN Species Survival CommissionImmune systemInbreeding avoidanceInclusive fitnessIndex of evolutionary biology articlesInternational Union for Conservation of NatureIntroduction to evolutionInvasive speciesInversion (evolutionary biology)Ireviken eventJurassicKin recognitionKin selectionLamarckismLast universal common ancestorLate Devonian extinctionLate Ordovician mass extinctionLatent extinction riskLau eventLazarus taxonLists of extinct speciesLiving fossilLocal extinctionMacroevolutionMarc EreshefskyMate choiceMating typeMendelian inheritanceMetabolismMicroevolutionMiddle Miocene disruptionMilford H. WolpoffMioceneMissing heritability problemMitochondrionModels of DNA evolutionModern synthesis (20th century)Modularity (biology)Molecular evolutionMonogamy in animalsMosaic evolutionMulde eventMuller's ratchetMulticellular organismMultigenomic organismMutationMutational meltdownMutationismMutualism (biology)Natural selectionNeo-DarwinismNeutral theory of molecular evolutionNonadaptive radiationNonecological speciationOlson's ExtinctionOn the Origin of SpeciesOrgan (biology)Origin and function of meiosisOrigin of avian flightOrigin of birdsOrthogenesisOutline of evolutionOverabundant speciesOverexploitationOvershoot (population)Oxford English DictionaryPaleoanthropologistPanspermiaParadox of enrichmentParallel evolutionParapatric speciationParaphylyParaspeciesParental investmentParent–offspring conflictPeripatric speciationPermian–Triassic extinction eventPhenotypic plasticityPhyletic gradualismPhylogenetic treePhylogeneticsPlastidPleiotropyPlio-PleistocenePliocenePoint mutationPollinator-mediated selectionPolymorphism (biology)Population (biology)Population geneticsProgrammed cell deathProtocellPseudoextinctionPunctuated equilibriumQuasi-extinctionQuaternary extinction eventReciprocal altruismRed Queen hypothesisReinforcement (speciation)Reproductive isolationSaltation (biology)Selective breedingSex-determination systemSexual dimorphismSexual selectionSexual selection in flowering plantsSexual selection in fungiSignalling theorySocial selectionSociocultural evolutionSpandrel (biology)SpeciationSpeciesSpecies complexSpecies selectionStructuralism (biology)SymbiogenesisSympatric speciationSystematicsTaxonTaxonomy (biology)Teleology in biologyTeleonomyTempo and Mode in EvolutionThe eclipse of DarwinismTheistic evolutionTimeline of extinctions in the HoloceneTimeline of the evolutionary history of lifeToarcian turnoverTransgenerational epigenetic inheritanceTransitional fossilTransmutation of speciesTriassic–Jurassic extinction eventTrivers–Willard hypothesisUniformitarianismUnit of selectionUniversity of California, BerkeleyVicar of Bray (scientific hypothesis)Viral evolutionVitalismVoluntary Human Extinction Movement
66 concepts already in your glossary