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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 V: Trends and Patterns in Plant Evolution
Pages 253-254

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From page 253...
... According to David Dilcher ("Toward a New Synthesis: Major Evolutionary Trends in the Angiosperm Fossil Record," Chapter 14) , three basic radiation nodes have been identified: the closed carper and radially symmetrical flower, the bilateral flower, and fleshy fruits with nutritious nuts and seeds.
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From page 254...
... These costs of outcrossing and reduced reproductive assurance lead to an over-representation of selfers and asexuals in newly-formed progeny, which may displace sexual outcrossers unless these enjoy compensating advantages in survival and reproduction. The damage wrought by invasive species costs $122 billion per year in the United States.
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Key Terms

  • plant species
  • changing environments
  • polyploid plant
  • respond adaptively
  • strongest selection

  • angiosperm fossil
  • basic radiation
  • highly adapted
  • evolutionary trends
  • towards outcrossing

  • genetic attributes
  • invasions typically
  • enjoy compensating
  • immediate circumstances
  • assurance lead

  • outcrossers suffer
  • selection directed
  • typically involve
  • lesser inbreeding
  • displace sexual

  • radially symmetrical
  • successful plant
  • genome rearrangement
  • common attribute
  • nutritious nuts

  • david dilcher
  • deletion mutations
  • symmetrical flower
  • bilateral flower
  • angiosperms promoted


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