Class 3: Evolution I - adaptive evolution -teacher notes Flashcards Preview

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Flashcards in Class 3: Evolution I - adaptive evolution -teacher notes Deck (18):
1

microevolution

change in genetic composition within a population, changes in a short time period, not major changes

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gene pool

collection of alleles and their frequences in a population

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genome

genetic complement of a typical somatic body cell of the individual

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alleles

genes existing as differenct versions

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allele frequencies

wehther proportion of each form of a gene (allel) within a population is changing

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causes of microevolutionary change

selection, mutation, gene flow (migration), genetic drift (small pop size)

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adaptation led to by

selection, mutation, gene flow (migration)

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selection

increase frequency of beneficial alleles

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types of selection

directional, stabilizing, disruptive selection

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directional selection

mean of distribution change and distribution shifts in favoried directio

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stailizing direction

location of distribution will not change but distribution will narrow

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disruptive selection

tails of distbution (extreme phenotypes) favored, distriubtion changes so two peaks form

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Core of Darwin's ideas

descent with modification, natural selection is mechanism for this evolutionary change

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descent with modification

organissm evolve and evolve from pre-exisitng species

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differential reproductive successi

individuals that possess traits that, for whatever reasons, confer upon them a greater reproductive output, will necessarily leave more descendants

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fitness / relative fitness

relative genetic contribution via offspring of each genotype to the next generation

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genotype

combo of alleles

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adaptation

traits that confer a reproductive advantage on the beareres are referre to as adaptations - heritable characteristics of an individual that increase reproductive success over individuals without the characteristics

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