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AP Biology Evolution Flashcards

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9298943013Carolus Linnaeus-physician and botanist who sought to classify life's diversity -binomial nomenclature (Homo sapien) -nested classification system, placing similar species into general characters0
9298943014Fossils-darwin drew from these (the remains or traces of organisms from the past)1
9298943015Strata-new layers of sediment cover older ones and compress them into layers of rock called strata -strata reveal the pattern of evolution that a species may take2
9298943016Paleontology-study of fossils, developed by Georges Cuvier 0noted that the older the stratum the more dissimilar fossils were to current life-forms -from one layer to the next, new species appeared while others disappeared -each boundary represented a sudden catastrophic event3
9298943017Charles Lyell-incorporated Hutton's thinking into his proposal that the same geologic processes are operating today as in the past, and at the same rate4
9298943018Jean-Baptiste Lamarck-found several lines of descent, a chronological series of older to younger fossils leading to a living species -use and disuse (giraffes' neck)5
9298943019Wallace-writes a paper with a similar hypothesis to Darwin based on the Malay archipelago6
9298943020Darwin-HMS beagle, interested in species in the galapagos (turtles, finches)7
9298943021Artificial Selection-modification of other species over many generations by selecting and breeding individuals with desired traits8
9298943022Darwin's 2 Inferenences-All species and produce more offspring than their enviorment can support and many of these offspring fail to survive and reproduce -This unequal ability of individuals to survive and reproduce will lead to the accumulation of favorable traits in the population over generations9
9298943023Homology-similarity resulting from common ancestry10
9298943024Homologous Structures-represent variations on a structural theme that was present in a common ancestor11
9298943025Vestigal Structures-remnants of features that served a function in the organism's ancestors12
9298943026Convergent Evolution-independent evolution of similar features in different lineages -ex: marsupials and sugar glider (same environment) -can occur when similar environmental pressures and natural selection exists13
9298943027Analogous-species share features b/c of convergent evolution, share similar function but not common ancestry (different structure)14
9298943028Biogeography-scientific study of the geographic distributions of species15
9298943029Phylogeny-evolutionary history of a species or group of species16
9298943030Systematics-discipline focused on classifying organisms and determining their evolutionary realationships17
9298943031Taxonomy-study of how organisms are named and classifed18
9298943032Order of ClassificationDomain, Kingdom, Phylum, Class, Order, Family, Genius, Species19
9298943033Sister Taxa-groups of organism that share an immediate common ancestor20
9298943034Rooted-branch point within the tree21
9298943035Polytomy-branch point from which more than two descendant groups emerge22
9298943036Analogy-similarity due to convergent evolution23
9298943037Homoplasies-analogous structures that arose independently24
9298943038Cladistic-common ancestry is the primary criterion used to classify organisms25
9298943039Clades-each of which includes an ancestral species of all its descendants26
9298943040Monophyletic-signifying that it consists of an ancestral species and all its descendants27
9298943041Paraphyletic-consists of an ancestral species and some of its descendants28
9298943042Polyphyletic-some of its members have different ancestors29
9298943043Shared Ancestral Character-character that originated in an ancestor of the taxon30
9298943044Shared Derived Character-evolutionary novelty unique to a clade31
9298943045Outgroup-species or group of species from an evolutionary lineage that is known to have diverged before the lineage including the species32
9298943046Maximum Parsimony-we should first investigate the simplest explanation that is consistent with the facts33
9298943047Molecular Clock-an approach for measuring the absolute time of evolutionary change based on the observation that some gens and other regions of genomes appear to evolve at constant rates34
9298943048Microevolution-a change in allele frequencies in a population over generations35
9298943049Genetic Variation-differences among individuals in the composition of their genes or other DNA sequences36
9298943050Population-group of individuals of the same species that live in the same area and interbreed creating fertile offspring37
9298943051Gene Pool-all copies of every type of allele at every locus in all members of the population38
9298943052Hardy-Weinberg Conditions-no mutations -random mating -no natural selection -very large population size -no gene flow39
9298943053Genetic Drift-chance events can alter allele allele frequencies to fluctuate from one generation to another (especially in one generation to another)40
9298943054Founder Effect-when few individuals become isolated from a larger population this smaller group may make a new population whose gene pool differs from the source population41
9298943055Bottleneck Effect-a severe drop in population results in the over or under representation of certain alleles.42
9298943056Gene Flow-transfer of allele into or out of a population from the movement of fertile individuals or their gametes43
9298943057Effects of Genetic Drift-Genetic Drift is significant in small populations -Genetic drift can cause allele frequencies to change at random -Genetic drift can lead to a loss of genetic variation within populations -Genetic drift can cause harmful alleles to become fixed44
9298943058Adaptive Evolution-NS increases the frequency of allele that provide an advantage and reproduce more45
9298943059Relative Fitness-contribution an individual makes to the gene pool relative to the contributions of indivdauls46
9298943060Directional Selection-conditions father shifting traits to one extreme47
9298943061Disruptive Selection-conditions favor individuals at both extremes of a phenotypic range48
9298943062Stabilizing Selection-reduces variation and gets rid of extreme phenotypes in the population49
9298943063Sexual Selection-form of natural selection in which individuals with certain inherited characteristics are more likely than others to obtain maits50
9298943064Sexual Dismorphism-difference in secondary sexual characteristics between males and females of the same species51
9298943065Intersexual Selection-individuals of one sex are choosy in selecting mates52
9298943066Neutral Variation-differences in DNA sequence that do not confer a selective advantage or disadvantage53
9298943067Balancing Selection-occurs when natural selection amintains two or more forms in a population54
9298943068Heterozygote Selection-individuals who are heterozygotes at a particular locus have a greater fitness than both kinds of homozygotes55
9298943069Frequency Dependent Selection-fitness of a phenotype depends on how commen it is56
9298943070Natural Selection Constraints1. Selection can only act on existing variation 2. Evolution is limited by historical constraints 3. Adaptations are often compromises 4. Chance, NS and the environment interact57
9298943071Species (according to the biological species concept)-group of population whose members have the potential to interbreed in nature and have the potential to produce viable, fertile offspring but do not58
9298943072Macroevolution-broad pattern of evolution above the species level59
9298943073Reproductive Isolation-existance of biological barriers that impede members of two species from interbreeding and producing viable, fertile offspring60
9298943074Hybrid-offspring from an interspecific mating61
9298943075Prezygotic Barriers-block fertilization from occuring62
9298943076Postzygotic Barriers-contribute to reproductive isolation after the hybrid zygote is formed63
9298943077Prezygotic Barrier Examples1. Habtitat Isolation 2. Temporal Isolation (nocturnal) 3. Behavior Isolation (courtship rituals) 4. Mechanical Isolation (snail shells) 5. Genetic Isolation (sperm can't survive in reproductive tract) HTBMG64
9298943078Postzygotic Barrier Examples1. Reduced Hybrid Viability (hybrid survivabilty is reduced) 2. Reduced Hybrid Fertility (mule) 3. Hybrid Breakdown (one hybrids mate with one another offspring of the next generation are feeble/sterile) VFB65
9298943079Morphological Species Concept-characterization of a species by body shape and other structural features66
9298943080Ecological Species Concept-species in terms of its ecological niche, the sum of how members interact with living and nonliving members of their enviorments67
9298943081Phylogenetic Species Concept-species is the smallest group of individuals that share a common ancestor68
9298943082Allopatric Speciation + Evidence-gene flow is interrupted when a population is divided into geographically isolated subpopulations -ex: snapping shrimp 30 species off the isthmus of panama69
9298943083Sympatric Speciation-speciation occurs in populations that live in the same geographic area70
9298943084Polyploidy-species may originate from an accident during cell divison resulting in extra chromsomes71
9298943085Autopolypoid-individual that has more than two chromosome sets that are all derived from the same species72
9298943086Allopolyploid-various mechanisms can change a sterile hybrid into a fertile polyploid. They can only mate with other allopolyploids not parents73
9298943087Hybrid Zone-region in which members of different species meet and mate, producing at least some offspring of mixed ancestry74
9298943088Fusion of Hybrid Zone-the two species fuse75
9298943089Stability of Hybrid Zone-continued production of a hybrid individual76
9298943090Reinforcement of Hybrid Zone-strengthening or reproductive barriers--hybrids cease to be made77
9298943091Punctuated Equilibria-Eldrege and Gould coined this to descibed these patterns in the fossil record: perioids of apparent stastis (moment of stability) punctuated by suddenc hange78
9298943092Radiometric Dating-based on the decay or radioactive isotopes -radioactive "parent" isotopes decay to "daughter" isotopes at a characteristic rate called a HALF LIFE79
9298943093Geologic Record-a standard time scale that divides the Earth's history into four eons and further subdivisions EON: Phanerozo(Mesozoic & Jurassic), Proterozoic, Archean, Hadean80
9298943094Mass Extinction-large numbers of a species become extinct world wide, caused by disruptive changes to the global enviroment81
9298943095Adaptive Radiations-periods of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill different ecological roles or niches in their communities82
9298943096Heterochromy-evolutionary change in the rate or timing of developmental events (Fetus-->Adult Skull)83
9298943097Homeotic Genes-master regulatory genes -determine basic features like the location of wings and legs on a bird -Hox genes provide information as to the positional information in an embryo84
9298943098Hypothesis for creation of Earth's First Life1. Abiotic synthesis of small organic molecules, monomers 2. Joining of these small molecules into macromolecules like proteins and nucleic acids, polymers 3. Packaging of these molecules into protobiont cells- droplets with membranes that maintained an internal chemsitry different than their surrondings 4. Origin of self-replicating molecules that made inheritance possible85
9298943099Ribozyme-RNA can perform many enzyme like, catalytic functions86
9298943100EndosymbiosisA process in which a unicellular organism (the "host") engulfs another cell, which lives within the host cell and ultimately becomes an organelle in the host cell; also refers to the hypothesis that mitochondria and plastids were formerly small prokaryotes that began living within larger cells.87

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