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5 Written questions

5 Matching questions

  1. ecological species concept
  2. punctuated equilibria
  3. phylogenetic species concept
  4. morphological species concept
  5. reinforcement
  1. a In evolutionary biology, a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species.
  2. b 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.
  3. c A definition of species in terms of measurable anatomical criteria.
  4. d A definition of species in terms of ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment.
  5. e A definition of species as the smallest group of individuals that share a common ancestor, forming one branch on the tree of life.

5 Multiple choice questions

  1. The formation of new species in populations that are geographically isolated from one another.
  2. A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.
  3. An individual that has more than two chromosome sets that are all derived from a single species.
  4. A chromosomal alteration in which the organism possesses more than two complete chromosome sets. It is the result of an accident of cell division.
  5. A reproductive barrier that impedes mating between species or hinders fertilization if interspecific mating is attempted.

5 True/False questions

  1. postzygotic barrierA reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults.


  2. speciesAn evolutionary process in which one species splits into two or more species.


  3. sympatric speciationThe formation of new species in populations that live in the same geographic area.


  4. allopolyploidA fertile individual that has more than two chromosome sets as a result of two different species interbreeding and combining their chromosomes.


  5. microevolutionEvolutionary change below the species level; change in the allele frequencies in a population over generations.


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