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54 if a few individuals migrate a long distance from

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54.If a few individuals migrate a long distancefrom their original population to colonize anisland and that population differs genetical-
ly from the original population, this is anexample of:55.Population structureSpecific to a species:
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Biol 1620 Exam 3 (Messina)Study online at 56.Spatial subdivision of a species is due toPatchy food, nesting sites, orother habitat features57.Gene flowmovement of individuals orgametes between subpopu-lationsthis averages out subpopu-lations, keeping them fromdifferentiating58.In a species that experiences gene flow, ifthe rate of migration is high, thengenetics will converge59.In a species that experiences gene flow, ifthe rate of migration is low, thendifferentiation will occur.60.There are many specific mechanisms of dis-persal and gene flow, includingPine pollen clouds, seedswith pappi, blue jays car-rying acorns, animal migra-tion, etc61.Gene flow keeps populations from . . .becoming different fromeach other62.Gene flow counteractsGenetic drift63.Gene flow can both ____________ and_______________ adaptive change in popu-lationsspeed up; slow down64.interferes; speeds up11 / 42
Biol 1620 Exam 3 (Messina)Study online at While gene flow usually ______________with natural selection, in rarer cases it_________________ natural selection.65.How can gene flow interfere with naturalselection?Gene flow usually interfereswith natural selection.When natural selection isacting locally, like if in twoneighboring populations an"a" allele is good in one butbad in the other, gene flowacts antagonistically againstnatural selection, maintain-ing a mix of that allele inboth populations instead ofletting it become more/lesscommon in a certain popula-tion.Example: only spraying 1/4fields with a certain pesticide66.Example of how gene flow prevents localadaptationIf only one region of a fieldis sprayed with a certain in-secticide, gene flow keepsbringing in the "wrong" (sus-ceptible) allele, preventingthese insects from adaptingto the pesticide67.If natural selection is acting ____________,gene flow interferes with natural selectionlocally68.If natural selection is acting ____________,gene flow speeds up natural selectionglobally12 / 42
Biol 1620 Exam 3 (Messina)Study online at

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Term
Fall
Professor
Rosen,V
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