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Relationships and biodiversity pre lab review
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Relationships and biodiversity pre lab review

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  • 1. New York State LabRelationships andBiodiversityPre-lab Review
  • 2. Evolution• Gradual change over time• If two organisms sharesimilarities, they are likelyrelated – share a commonancestor• The more similarities, themore closely related
  • 3. Evidence of Evolutionary Relationships• Structural evidence:– Comparative anatomy• Homologous structures• Vestigial structures– Comparative embryology
  • 4. Evidence of Evolutionary Relationships• Molecular evidence:– Comparative Biochemistry• Similar pigments (in plants)• Similar enzyme-controlled chemical reactions• Similarities in DNA structure• Similar proteins
  • 5. Structural Evidence in Plants• External structure• Seeds• Internal structure:– Conducting tissue – carries materials– Xylem – carries water and nutrients– Phloem – carries food
  • 6. Molecular Evidence in Plants• Pigments – absorb light• Chromatography – lab technique to separatepigments in plants
  • 7. Molecular Evidence in Plants• Enzymes – speed up chemical reactions• Enzymes are specific
  • 8. Molecular Evidence in Plants –Enzymes
  • 9. Molecular Evidence in Plants• Gel electrophoresis – labtechnique to separatefragments of DNA fromorganisms
  • 10. Molecular Evidence in Plants –Gel Electrophoresis
  • 11. Molecular Evidence in Plants• Similarities in DNA code for amino acidsequence in particular proteins
  • 12. Molecular Evidence in PlantsProtein Synthesis
  • 13. Molecular Evidence in Plants