Class 4: Evolution II - non adaptive evolution - teacher notes Flashcards Preview

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Flashcards in Class 4: Evolution II - non adaptive evolution - teacher notes Deck (14):
1

adaptive evolution

evolutionary change due to natural selection

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non adaptive evolutionary forces

mutation,g ene fow, genetic drift, can change genetic composition of a population but not in waytthat causes avg individual in pop to bbe mbetter matched to environemnt

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mutation

change in nucleotide sequence of seueqnce of DNA such that diff allele is created

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allele

particular version of gene

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mutation is a ___ evolutionary force

weak

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significance of mutation

provides raw material where natural selection can operate

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mutations are random relative to

need, does not arise to solve rpoblems faced by organism, random relative to needs of organisms

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gene flow

migrating - movement of genetic material from one population to another

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effect of gene flow

reduces dffrernces among pops, increases genetic diversity within local populations

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genetic drift is ____

smapling within populations - random, causes genetic rrandom evolution

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genetic drift tends to

make individual pops of a species diff from each other as allel frequences in each pop will drift in different directions, decrease amount of genetic diversity within each pop

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founder effect

individuals randomly selected to start "found" a new population, small, genetically ifferent

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bottleneck effect

large population is quickly reduce in size such that remaining individuals are small, random sample of orgiinal population

14

effective population size

being much smaler than actual pop size, increase the strength of drift

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