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Mech. of Evolution

Evolution

QuestionAnswer
biological species population whose members can interbreed and produce fertile offspring
geographical isolation species occur in different regions and will never interbreed
ecological reproductive isolation species in same region, but in different habitats, so rarely encounter
temporal reproductive isolation sepcies which breed at different times of day, year, season, and cannot mix gametes
behavioral reproductive isolation unique behavioral patterms and rituals
mechanical reproductive isolation physiological differences prevent sucessful mating
gametic reproductive isolation sperm of one species may not fertilize eggs of another species
immigration when an individual leaves population
emmigration when individual enters population
genetic drift chance events changing frequency of traits in population
founder effect when a new pop. is started by small group of individuals
bottleneck effect when pop. is drastically effected by a disaster
predation selection act on predator/prey
physiological selection acting on body functions (disease resistanc, protection from injury
sexual selection non random mating, attractiveness to mate
directional selects for one extreme
stabilizing selects for average
disruptive selects for both extremes
gradualism gradual divergence over long spans of time
punctuated equilibruim rapid burst of change
convergent evolution unrelated species live in similar environments and develop similar traits
divergent evolution ADAPTIVE RADIATION, populations once similar change and adapt to different environments
coevolution workiing together
Created by: xcemma
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