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Campbell Biology Chapter 22 Flashcards

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9172270351CatastrophismExplanation of landforms and fossil faunas by floods.0
9172270353Voyage of the H.M.S. Beagle 1831-361
9172270354Galapagos IslandsVolcanic archipelago; Geologically young. Diversification (adaptive radiation) from mainland ancestors.2
9172270356Evolution by Natural SelectionMembers of a population vary in their traits. Traits are inherited from parents to offspring. More individuals are born than will survive to reproduce. Some individuals are more likely to survive and reproduce because of their heritable characteristics. Those characteristics become more common in the next generation.3
9172270357EvolutionEvolution happens to populations, not individuals. Evolution can happen through artificial selection, natural selection, or by chance ("genetic drift").4
9172270358Artificial SelectionArtificial selection alters animals and plants through the same mechanism as natural selection but is directed by man.5
9172270359AdaptationChange to fit the environment. Characteristics that favor (survival and) reproduction become more common.6
9172270360SpeciesSpecies generally do not interbreed or share alleles with one another, so each is an independent entity.7
9172270361Darwin's EvidenceDomesticated varieties and effects of artificial selection . Fossil record. Comparative anatomy and homology. Biogeography- (including island faunas).8
9172270362Homology2 things are similar because of common origin and retention of similarity. Both are copies of an original. (or copies of copies)9
9172270363Analogy2 things have different origin but have become similar. They have converged.10
9172270364Molecular HomologiesSequence similarity can be quantified. (% identity) Statistical analysis can be used to reconstruct relationships. (molecular phylogeny)11
9172270365BiogeographyOrganisms in different places evolved there over time. ie. Galapagos Finches and Australian Marsupials.12
9172270366MicroevolutionChange of allele frequency in a population over generations.13
9172270367MacroevolotionOrigin of species and higher taxa through microevolutionary processes and other factors.14
9172270368Hardy-Weinberg TheoremRandom mating, no natural selection, no mutation, no migration, large population15
9172270373Directional selectionselection for one extreme16
9172270374Disruptive selectionselection for both extremes17
9172270375Stabilizing selectionselection for average form18
9172270377Sexual selectionpick mate based on trait19
9172270381Intrasexual CompetitionMale-male competition for access to mates. Leads to sexual dimorphism20
9172270382Intersexual CompetitionFemales choose between male mates.21
9172270383Gene FlowImmigration or emigration of individuals to and from a population can alter allele frequencies and bring in new alleles.22
9172270384MutationMutation is a source of new alleles but is unlikely to change allele frequencies because it is a rare event.23

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