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AP Biology Evolution Flashcards

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9596036848Carolus Linnaeus-physician and botanist who sought to classify life's diversity -binomial nomenclature (Homo sapien) -nested classification system, placing similar species into general characters0
9596036849Fossils-darwin drew from these (the remains or traces of organisms from the past)1
9596036850Strata-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
9596036851Paleontology-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
9596036852Charles 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
9596036853Jean-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
9596036854Wallace-writes a paper with a similar hypothesis to Darwin based on the Malay archipelago6
9596036855Darwin-HMS beagle, interested in species in the galapagos (turtles, finches)7
9596036856Artificial Selection-modification of other species over many generations by selecting and breeding individuals with desired traits8
9596036857Darwin'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
9596036858Homology-similarity resulting from common ancestry10
9596036859Homologous Structures-represent variations on a structural theme that was present in a common ancestor11
9596036860Vestigal Structures-remnants of features that served a function in the organism's ancestors12
9596036861Convergent 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
9596036862Analogous-species share features b/c of convergent evolution, share similar function but not common ancestry (different structure)14
9596036863Biogeography-scientific study of the geographic distributions of species15
9596036864Phylogeny-evolutionary history of a species or group of species16
9596036865Systematics-discipline focused on classifying organisms and determining their evolutionary realationships17
9596036866Taxonomy-study of how organisms are named and classifed18
9596036867Order of ClassificationDomain, Kingdom, Phylum, Class, Order, Family, Genius, Species19
9596036868Sister Taxa-groups of organism that share an immediate common ancestor20
9596036869Rooted-branch point within the tree21
9596036870Polytomy-branch point from which more than two descendant groups emerge22
9596036871Analogy-similarity due to convergent evolution23
9596036872Homoplasies-analogous structures that arose independently24
9596036873Cladistic-common ancestry is the primary criterion used to classify organisms25
9596036874Clades-each of which includes an ancestral species of all its descendants26
9596036875Monophyletic-signifying that it consists of an ancestral species and all its descendants27
9596036876Paraphyletic-consists of an ancestral species and some of its descendants28
9596036877Polyphyletic-some of its members have different ancestors29
9596036878Shared Ancestral Character-character that originated in an ancestor of the taxon30
9596036879Shared Derived Character-evolutionary novelty unique to a clade31
9596036880Outgroup-species or group of species from an evolutionary lineage that is known to have diverged before the lineage including the species32
9596036881Maximum Parsimony-we should first investigate the simplest explanation that is consistent with the facts33
9596036882Molecular 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
9596036883Microevolution-a change in allele frequencies in a population over generations35
9596036884Genetic Variation-differences among individuals in the composition of their genes or other DNA sequences36
9596036885Population-group of individuals of the same species that live in the same area and interbreed creating fertile offspring37
9596036886Gene Pool-all copies of every type of allele at every locus in all members of the population38
9596036887Hardy-Weinberg Conditions-no mutations -random mating -no natural selection -very large population size -no gene flow39
9596036888Genetic Drift-chance events can alter allele allele frequencies to fluctuate from one generation to another (especially in one generation to another)40
9596036889Founder 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
9596036890Bottleneck Effect-a severe drop in population results in the over or under representation of certain alleles.42
9596036891Gene Flow-transfer of allele into or out of a population from the movement of fertile individuals or their gametes43
9596036892Effects 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
9596036893Adaptive Evolution-NS increases the frequency of allele that provide an advantage and reproduce more45
9596036894Relative Fitness-contribution an individual makes to the gene pool relative to the contributions of indivdauls46
9596036895Directional Selection-conditions father shifting traits to one extreme47
9596036896Disruptive Selection-conditions favor individuals at both extremes of a phenotypic range48
9596036897Stabilizing Selection-reduces variation and gets rid of extreme phenotypes in the population49
9596036898Sexual Selection-form of natural selection in which individuals with certain inherited characteristics are more likely than others to obtain maits50
9596036899Sexual Dismorphism-difference in secondary sexual characteristics between males and females of the same species51
9596036900Intersexual Selection-individuals of one sex are choosy in selecting mates52
9596036901Neutral Variation-differences in DNA sequence that do not confer a selective advantage or disadvantage53
9596036902Balancing Selection-occurs when natural selection amintains two or more forms in a population54
9596036903Heterozygote Selection-individuals who are heterozygotes at a particular locus have a greater fitness than both kinds of homozygotes55
9596036904Frequency Dependent Selection-fitness of a phenotype depends on how commen it is56
9596036905Natural 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
9596036906Species (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
9596036907Macroevolution-broad pattern of evolution above the species level59
9596036908Reproductive Isolation-existance of biological barriers that impede members of two species from interbreeding and producing viable, fertile offspring60
9596036909Hybrid-offspring from an interspecific mating61
9596036910Prezygotic Barriers-block fertilization from occuring62
9596036911Postzygotic Barriers-contribute to reproductive isolation after the hybrid zygote is formed63
9596036912Prezygotic 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
9596036913Postzygotic 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
9596036914Morphological Species Concept-characterization of a species by body shape and other structural features66
9596036915Ecological Species Concept-species in terms of its ecological niche, the sum of how members interact with living and nonliving members of their enviorments67
9596036916Phylogenetic Species Concept-species is the smallest group of individuals that share a common ancestor68
9596036917Allopatric 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
9596036918Sympatric Speciation-speciation occurs in populations that live in the same geographic area70
9596036919Polyploidy-species may originate from an accident during cell divison resulting in extra chromsomes71
9596036920Autopolypoid-individual that has more than two chromosome sets that are all derived from the same species72
9596036921Allopolyploid-various mechanisms can change a sterile hybrid into a fertile polyploid. They can only mate with other allopolyploids not parents73
9596036922Hybrid Zone-region in which members of different species meet and mate, producing at least some offspring of mixed ancestry74
9596036923Fusion of Hybrid Zone-the two species fuse75
9596036924Stability of Hybrid Zone-continued production of a hybrid individual76
9596036925Reinforcement of Hybrid Zone-strengthening or reproductive barriers--hybrids cease to be made77
9596036926Punctuated 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
9596036927Radiometric Dating-based on the decay or radioactive isotopes -radioactive "parent" isotopes decay to "daughter" isotopes at a characteristic rate called a HALF LIFE79
9596036928Geologic Record-a standard time scale that divides the Earth's history into four eons and further subdivisions EON: Phanerozo(Mesozoic & Jurassic), Proterozoic, Archean, Hadean80
9596036929Mass Extinction-large numbers of a species become extinct world wide, caused by disruptive changes to the global enviroment81
9596036930Adaptive 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
9596036931Heterochromy-evolutionary change in the rate or timing of developmental events (Fetus-->Adult Skull)83
9596036932Homeotic 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
9596036933Hypothesis 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
9596036934Ribozyme-RNA can perform many enzyme like, catalytic functions86
9596036935EndosymbiosisA 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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