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Campbell Biology Chapter 22 Flashcards

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8572360959CatastrophismExplanation of landforms and fossil faunas by floods.0
8572360960UniformitarianismPresent state of earth could be explained by gradual processes of sedimentation.1
8572360961Voyage of the H.M.S. Beagle 1831-362
8572360962Galapagos IslandsVolcanic archipelago; Geologically young. Diversification (adaptive radiation) from mainland ancestors.3
8572360963Darwin's Finches14 species found on the Galapagos.4
8572360964Evolution 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.5
8572360965EvolutionEvolution happens to populations, not individuals. Evolution can happen through artificial selection, natural selection, or by chance ("genetic drift").6
8572360966Artificial SelectionArtificial selection alters animals and plants through the same mechanism as natural selection but is directed by man.7
8572360967AdaptationChange to fit the environment. Characteristics that favor (survival and) reproduction become more common.8
8572360968SpeciesSpecies generally do not interbreed or share alleles with one another, so each is an independent entity.9
8572360969Darwin's EvidenceDomesticated varieties and effects of artificial selection . Fossil record. Comparative anatomy and homology. Biogeography- (including island faunas).10
8572360970Homology2 things are similar because of common origin and retention of similarity. Both are copies of an original. (or copies of copies)11
8572360971Analogy2 things have different origin but have become similar. They have converged.12
8572360972Molecular HomologiesSequence similarity can be quantified. (% identity) Statistical analysis can be used to reconstruct relationships. (molecular phylogeny)13
8572360973BiogeographyOrganisms in different places evolved there over time. ie. Galapagos Finches and Australian Marsupials.14
8572360974MicroevolutionChange of allele frequency in a population over generations.15
8572360975MacroevolotionOrigin of species and higher taxa through microevolutionary processes and other factors.16
8572360976Hardy-Weinberg TheoremRandomly mating populations free from evolutionary forces, allele frequencies (p and q) do not change.17
8572360977Genotype frequencies stabilize after one generation of random mating to p squared + 2pq + q squared = 118
8572360978Calculating Allele FrequenciesBy gene counting: p = f(A) = (2 X count of AA)+(count of Aa)/(2 X N) where N = total number of individuals19
8572360979By genotype frequencies: p = f(A) = f(AA) + ½ f(Aa)https://o.quizlet.com/KiPiEll9bTFqrtNlILl2bA_m.png20
8572360980Factors of MicroevolutionNatural or artificial21
8572360981Directional22
8572360982Diversifying23
8572360983Stabilizing24
8572360984Frequency dependent25
8572360985Sexual26
8572360986Directional SelectionAn extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. https://o.quizlet.com/H-bKmMTp5hg9jnyP45BfyQ_m.png27
8572360987Diversifying SelectionExtreme values for a trait are favored over intermediate values. The variance of the trait increases and the population is divided into two distinct groups. https://o.quizlet.com/H-bKmMTp5hg9jnyP45BfyQ_m.png28
8572360988Stabilizing SelectionFavors the intermediate variants. It reduces phenotypic variation. https://o.quizlet.com/H-bKmMTp5hg9jnyP45BfyQ_m.png29
8572360989Intrasexual CompetitionMale-male competition for access to mates. Leads to sexual dimorphism https://farm6.staticflickr.com/5127/5379599365_4b860c547f_m.jpg30
8572360990Intersexual CompetitionFemales choose between male mates. https://farm5.staticflickr.com/4014/4395063913_b8b9533bc4_m.jpg31
8572360991Gene FlowImmigration or emigration of individuals to and from a population can alter allele frequencies and bring in new alleles. https://o.quizlet.com/-Pz-zrdzWMpUVy0jl.wJPw_m.png32
8572360992MutationMutation is a source of new alleles but is unlikely to change allele frequencies because it is a rare event.33

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