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Campbell's Biology Chapter 22 Flashcards

Decent with modification: Darwinian view of evolution

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205940002natural selectionmechanism of evolution whereby there is differential reproductive success0
205940003artificial selectionmechanism of evolution whereby "humans" control the reproduction of living organisms favoring or not favoring specific traits1
205940004evolutionchange over time2
205940005speciationformation of a new species3
205940006extinctorganisms that are no longer alive on Earth4
205940007extantrefers to organisms that are currently present on Earth5
205940008alleleone of two or more alternative forms of genes6
205940009population geneticsthe study of the genetics of the overall group/population7
205940010homologous structuresstructures that are anatomically similar but perform different functions, example a forelimb of a bat and cat, signs of closer evolutionary ancestry8
205940011analogous structuresstructures that are anatomically dissimilar but perform similar functions, example a bat wing and bee wing, signs of more distant evolutionary ancestry9
205940012gene flowthe movement of genes between different populations, immigration and emigration10
205940013mutationa permanent change in a cell's DNA11
205940014genetic driftrandom changes in allele frequencies, effects most pronounced in small populations12
205940015divergent evolutiondescription of an evolutionary history that demonstrates branching evolution and a more common/shared ancestry13
205940016convergent evolutiondescription of an evolutionary history that demonstrates individual development of similar structures and a less common ancestry14
205940017microevolutionchange in allele frequencies in a population over time15
205940018assortive matingthe mating of phenotypically similar organisms16
205940019genotypethe genetic makeup at a particular locus17
205940020phenotypethe visible appearance, the trait that is observed18
205940021fitnessthe genetic contribution of an individual to succeeding generations, quantifying reproductive success19
205940022relative fitnessthe fitness of one individual when compare to another20
205940023frequency dependent selectionthis is when the frequency or % of the individuals with that phenotype compared to the alternate phenotypes alters fitness21
205940024heterozygote advantagenatural selection that favors the heterozygote genotype and phenotype over both homozygous genotype, maintains variation in a population22
205940025stabilizing selectionselection acts to increase the average phenotype, occurs when the average phenotype is well matched with the environment23
205940026disruptive selectionselection acts to favor both extreme phenotypes and is often associated with future speciation events24
205940027directional selectionselection that favors one of the extremes and not the other25

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