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Chapter 16 - Chapter 16 Vocabulary 1 adaptive radiation the...

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Chapter 16  Vocabulary   1. adaptive radiation -  the rise of many new species in a relatively short time as a  result of a single species that invades different habitats and evolves under  different environmental pressures  2. allopatric speciation -  speciation that occurs when two populations are  separated by a physical barrier that prevents gene flow between them 3. biological species concept -  4. Extinction -  the death of all members of a species  5. isolating mechanism -  a morphological, physiological, behavioral or ecological  difference that prevents members of two species from interbreeding  6. Polyploidy -  having more than two homologous chromosomes of each type  7. postmating isolating mechanism -  any structure, physiological function, or  developmental abnormality that prevents organisms of two different populations,  once mating has occurred, from producing vigorous, fertile offspring  8. premating isolating mechanism -  any structure, physiological function, or  behavior that prevents organisms of two different populations from exchanging  gametes  9.
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