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Variation and Evolution in Plants and Microorganisms Toward a New Synthesis 50 Years After Stebbins (2000) / Chapter Skim
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Part IV: Population Variation
Pages 165-166

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From page 165...
... Today we know that transposable elements make up a large fraction of the DNA of agriculturally important plants, such as corn and wheat, and of animals such as mice and humans, and perhaps all species of mammals and many other vertebrates. Fedoroff reviews the history of the discovery of transposing elements and advances the hypothesis that the mechanisms controlling transposition are an instance of "the more general capacity of eukaryotic organisms to detect, mark, and retain duplicated DNA through regressive chromatin structures." Grasses (family Poaceae)
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From page 166...
... The mathematical theory of gene coalescence has provided the analytical tools for reconstruction and interpretation. Schaal and Olsen put all these tools to good use in several model cases: the recent rapid geographic expansion of Arabidopsis thaliana, with little differentiation between populations; the recolonization of European tree species from refugia created by the Pleistocene glaciation; the origin and domestication of cassava (maniac)
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Key Terms

  • white flowers
  • plant nuclear
  • duplicated dna
  • experimental study
  • chromatin structures

  • individual variation
  • special promise
  • regressive chromatin
  • gene interactions
  • carbohydrate source

  • phenotypic differences
  • genetic levels
  • refugia created
  • european tree
  • family poaceae

  • protein electrophoresis
  • mechanisms controlling
  • allelic variation
  • analyzing adaptation
  • insect pollinators

  • plants indicates
  • geographic distribution
  • tree species
  • genome size
  • little differentiation

  • structural complexity
  • nuclear dnas
  • cultivated maize
  • color development
  • geographic expansion


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