"The Origin of Species" Evolutionary Biology, BIOL 152 CSU Chico
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each of the black spaces below before clicking
on it to display the answer.
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| sympatric | species that occur together
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| gene pools | all alleles present in a species
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| biological species concept | "...groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups."
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| reproductively isolated | populations whose members do not mate with each other or who cannot produce fertile offspring
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| reproductive isolating mechanisms | prevent genetic exchange between organisms
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| prezygotic isolating mechanisms | prevent the formation of zygotes
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| pheromones | chemical signals
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| reinforcement | improvement of isolating mechanisms resulting in complete reproductive isolation
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| polyploidy | produces individuals that have more than two sets of chromosomes
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| autoploidy | all of the chromosomes come from a single species
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| allopolyploidy | two species hybridize
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| adaptive radiation | groups of closely related species that have recently evolved from a common ancestor and have adapted to their environments
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| key innovation | evolves within a species allowing it to use resources that it couldnt use before
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| gradualism | evolution occured very slowly
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| stasis | little or no evolutionary change
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| punctuated equilibrium | long periods of stasis punctuated with small bursts of evolution
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