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Campbell Biology Chapter 22 Flashcards

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12581646463CatastrophismExplanation of landforms and fossil faunas by floods.0
12581646486Voyage of the H.M.S. Beagle 1831-361
12581646464Galapagos IslandsVolcanic archipelago; Geologically young. Diversification (adaptive radiation) from mainland ancestors.2
12581646465Evolution by Natural SelectionA process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than do other individuals because of those traits.3
12581646466EvolutionDescent with modification; the change in the genetic composition of a population from generation to generation. Evolution happens to populations, not individuals. Evolution can happen through artificial selection, natural selection, or by chance ("genetic drift").4
12581646467Artificial SelectionArtificial selection alters animals and plants through the same mechanism as natural selection to produce desired traits but is directed by man.5
12581646468AdaptationInherited characteristics that that enhance survival and reproduction in specific environments6
12581646469SpeciesSpecies generally do not interbreed or share alleles with one another, so each is an independent entity.7
12581646470Darwin's EvidenceDomesticated varieties and effects of artificial selection . Fossil record. Comparative anatomy and homology. Biogeography- (including island faunas).8
12581646471Homology2 things are similar because of common origin and retention of similarity. Both are copies of an original. (or copies of copies)9
12581646472Analogy2 things have different origin but have become similar. They have converged.10
12581646473Molecular HomologiesSequence similarity can be quantified. (% identity) Statistical analysis can be used to reconstruct relationships. (molecular phylogeny)11
12581646474BiogeographyThe scientific study for the geographic distributions of species; organisms in different places evolved there over time. ie. Galapagos Finches and Australian Marsupials.12
12581646475MicroevolutionChange of allele frequency in a population over generations.13
12581646476MacroevolutionOrigin of species and higher taxa through microevolutionary processes and other factors.14
12581646477Hardy-Weinberg TheoremRandom mating, no natural selection, no mutation, no migration, large population15
12581646478Directional selectionselection for one extreme16
12581646479Disruptive selectionselection for both extremes17
12581646480Stabilizing selectionselection for average form18
12581646481Sexual selectionpick mate based on trait19
12581646482Intrasexual CompetitionMale-male competition for access to mates. Leads to sexual dimorphism20
12581646483Intersexual CompetitionFemales choose between male mates.21
12581646484Gene FlowImmigration or emigration of individuals to and from a population can alter allele frequencies and bring in new alleles.22
12581646485MutationMutation is a source of new alleles but is unlikely to change allele frequencies because it is a rare event.23
12581806872Descent with modificationThe principle that each living species has descended, with changes, from other species over time24
12581825213Observations and inferences as the basis for descent with modification/evolutionObservation 1: Members of a population vary in their inherited traits. Observation 2: All species can produce more offspring than their environment can support, and many of these offspring fail to survive and reproduce Inference 1: Individuals whose inherited traits give them a higher probability of surviving and reproducing in a given environment tend to leave more offspring than do other individuals. Inference 2: This unequal ability of individuals to survive and reproduce will lead to the accumulation of favorable traits in the population over generations.25
12582015399Linnaeus created what system of classificationNested classification system26
12582027431Scala naturaeAll living organisms arranged in a linear order from simple to complex27
12582041110StrataSuperimposed layers of sedimentary rock28
12582046338PaleontologyThe study of fossils, developed by Cuvier29
12582051158CuvierCatastrophism: interpreted paleontology to support sudden catastrophic events in which areas were repopulated by different species immigrating from other areas. Believed species don't evolve.30
12582107618LamarckFrench biologist who proposed that life changes through two principles. 1. Use and disuse: parts of the body that are used extensively become larger and stronger (giraffes stretching neck to reach leaves on high branches) 2. Inheritance of acquired characteristics: organism can pass on these modifications to its offspring. Variation is a result of an innate drive to become more complex31
12582243214Points to remember about natural selection1. Individuals do not evolve 2. If all of the individuals within a population are genetically identical for that trait, evolution by natural selection cannot occur. 3. Even if a trait is favorable in one place or time, it may be useless in another place or time.32
12584707084Vestigial structuresRemnants of features that served a function in the organism's ancestors33
12584710881Homologous structuresVariations on a structural theme that was present in their common ancestor (not necessarily similar structure)34
12585004852S. Aureus and soapberry bug examples highlight which three points about natural selection1. Natural selection is a process of editing, not a creative mechanism (natural selection doesn't create but just edits/deletes organisms that are unfit). 2. Evolution can occur rapidly with new generations; just a few years with S. aureus or decades with soapberry bugs. 3. Natural selection depends on time and place, favoring those that match the current, local environment.35
12585031786Evidences of evolutionary change1. Direct observation (introduced species: the soapberry bugs, evolution of S. Aureus) 2. Homology (homologous structures, vestigial structures, homologous but possibly inactive genes) 3. Fossil Record (changes within a species, interconnectedness/relation between different species/common ancestors) 4. Biogeography36
12585073045Evolutionary TreeA diagram that reflects evolutionary relationships among groups of organisms37
12585092300Convergent EvolutionProcess by which unrelated organisms independently evolve similarities when adapting to similar environments38
12585098510Analogous StructuresStructures that do not have a common evolutionary origin but are similar in function (similar function but not common ancestry)39
12585187301Fossil record provides evidence of1. Extinction of species 2. Origin of new groups 3. Changes within groups over time40
12585219545EndemicA species that is native or confined to a particular region or people41
12585285347Hutton and LyellThought that geologic change could result from gradual mechanisms that operated in the past in the same manner as they do today42

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