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AP Biology: Evolution Flashcards

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9602060502EvolutionA change in allele frequencies in a population over many generations.0
9602060503Allelethe different versions of a gene1
9602060504Hardy-Weinberg Equationp² + 2pq + q² =12
9602060505Gene flowMovement of alleles into or out of a population due to the migration of individuals to or from the population. It INCREASES diversity.3
9602060506MutationsRandom errors in gene replication that lead to a change in the sequence of nucleotides. The source of all genetic diversity.4
9602060507Nonrandom matingIndividuals choose their mates for a specific reason.5
9602060508Natural SelectionA process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.6
9602060509Genetic DriftA change in the gene pool of a population due to chance. It LIMITS diversity.7
9602060510Bottleneck EffectWhen a population has been dramatically reduced, and the gene pool is no longer reflective of the original population's. It LIMITS diversity.8
9602060511The Founder EffectWhen a small population breaks away from a larger one to colonize a new area, it is most likely not genetically representative of the original larger population.9
9602060512Gene PoolAll of the alleles in all the individuals that make up a population10
9602060513HeterozygousAn organism that has two different alleles for a trait11
9602060514HomozygousHaving two identical alleles for a particular gene12
9602060515LinnaeusInvented binomial nomenclature13
9602060516Lamarckinheritance of acquired characteristics14
9602060517DarwinEnglish natural scientist who formulated a theory of evolution by natural selection15
9602060518Stabilizing SelectionNatural selection in which intermediate phenotypes survive or reproduce more successfully than do extreme phenotypes.16
9602060519Disruptive SelectionIncreases the extreme types in a population at the expense of intermediate forms. Over great lengths of time, disruptive selection may result in the formation of two new species.17
9602060520Directional SelectionNatural selection in which individuals at one end of the phenotypic range survive or reproduce more successfully than do other individuals.18
9602060521Artificial SelectionHumans breed plants and animals by seeking individual with desired traits as breeding stock.19
9602060522FitnessHow well an organism can survive and reproduce in its environment20
9602060523Adaptive evolutionAn evolutionary process that is directed by natural selection, which makes a population better adapted to live in an environment.21
9602060524Allopatric Speciationthe evolution of new species through the process of geographic isolation into two separate environments22
9602060525Sympatric Speciationoccurs when a species evolves into a new species in an area without a geographic barrier23
9602060526Continental DriftWegener's idea that the continents slowly moved over Earth's surface, leading to allopatric speciation24
9602060527Diploidhaving two sets of chromosomes25
9602060528HaploidCell that has half the number of chromosomes as body cells26
9602060529Heterozygote advantagegreater reproductive success of heterozygous individuals compared with homozygotes; tends to preserve variation in a gene pool27
9602060530Homologous StructuresStructures that come from the same ancestor...have a common origin and reflect a common ancestry.28
9602060531Analogous StructuresSimilar in function but not structure, like the wing of a bat and the wing of a butterfly.29
9602060532Convergent EvolutionThe process by which unrelated species become more similar as they adapt to the same kind of environment30
9602060533Prezygotic barriersPrevent mating between different species by blocking the zygote from forming31
9602060534Postzygotic barriersPrevent the hybrid zygote from developing into a viable, fertile adult32

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