Chapter 24 Review cont.

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  1. six sets of chromosomes, two sets from each of three different specices
  2. a region in which members of different species meet and mate, producing at least some offspring of mixed ancestry
    hybrid zone
  3. a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing chances of hyrbid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species
  4. In a __, new species change most as they branch from a parent species and then change little for the rest of their existence.
    punctuated pattern
  5. In the fossil record, long periods of apparent stasis, in which a species undergoes little or no morphological change, interrupted by relatively brief periods of sudden change.
    punctuated equilibria
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Chapter 24 Review cont.
AP Biology
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