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5 Written questions

5 Matching questions

  1. microevolution
  2. punctuated equilibria
  3. speciation
  4. postzygotic barrier
  5. prezygotic barrier
  1. a Evolutionary change below the species level; change in the allele frequencies in a population over generations.
  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 reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults.
  4. d An evolutionary process in which one species splits into two or more species.
  5. e A reproductive barrier that impedes mating between species or hinders fertilization if interspecific mating is attempted.

5 Multiple choice questions

  1. Evolutionary change above the species level. Examples of this type of change include the origin of a new group of organisms through a series of speciation events and the impact of mass extinctions on the diversity of life and its subsequent recovery.
  2. The existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring.
  3. A definition of species in terms of measurable anatomical criteria.
  4. A fertile individual that has more than two chromosome sets as a result of two different species interbreeding and combining their chromosomes.
  5. 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.

5 True/False questions

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


  2. ecological species conceptDefinition of a species as a group of populations whose members have the potential to interbreed in nature and produce viable, fertile, offspring, but do not produce viable, fertile offspring with members of other such groups.


  3. hybrid zoneOffspring that results from the mating of individuals from two different species or from two true-breeding varieties of the same species.


  4. phylogenetic species conceptA 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. polyploidyA chromosomal alteration in which the organism possesses more than two complete chromosome sets. It is the result of an accident of cell division.