Download
the major lineages of life n.
Skip this Video
Loading SlideShow in 5 Seconds..
The Major Lineages of Life PowerPoint Presentation
Download Presentation
The Major Lineages of Life

The Major Lineages of Life

402 Vues Download Presentation
Télécharger la présentation

The Major Lineages of Life

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. The Major Lineages of Life • Molecular datachallenges 5 Kingdoms • Monera was too diverse • 2 distinct lineages of prokaryotes • Protists are still too diverse • not yet sorted out

  2. Chapter 26 Phylogeny and the Tree of Life • Phylogeny is the evolutionary history of a species or group of related species • The discipline of systematics classifies organisms and determines their evolutionary relationships • Systematists use fossil, molecular, and genetic data to infer evolutionary relationships • Taxonomy is the ordered division and naming of organisms

  3. 3 Domain system • Domains = “Super” Kingdoms • Bacteria • Archaea • extremophiles = live in extreme environments • methanogens • halogens • thermophiles • Eukarya • eukaryotes • protists • fungi • plants • animals

  4. Eukaryote Prokaryote Archaebacteria&Bacteria Classification • Old 5 Kingdom system • Monera, Protists, Plants, Fungi, Animals • New 3 Domain system • reflects a greater understanding of evolution & molecular evidence • Prokaryote: Bacteria • Prokaryote: Archaebacteria • Eukaryotes • Protists • Plants • Fungi • Animals

  5. KingdomBacteria KingdomArchaebacteria KingdomProtista KingdomFungi KingdomPlantae KingdomAnimalia

  6. Kingdoms Fungi Animalia absorptivenutrition ingestivenutrition Plantae autotrophs heterotrophs Protista uni- tomulticellular multicellular Eubacteria Archaebacteria prokaryotes eukaryotes Single-celled ancestor

  7. Finding commonality in variety • Organisms classified from most general group, domain, down to most specific, species • domain, kingdom, phylum, class, order, family, genus, species use the mnemonic!

  8. The Evolutionary Perspective

  9. Phylogenies are inferred from morphological and molecular data • To infer phylogenies, systematists gather information about morphologies, genes, and biochemistry of living organisms • Organisms with similar morphologies or DNA sequences are likely to be more closely related than organisms with different structures or sequences

  10. Cladistics • Cladistics groups organisms by common descent • A clade is a group of species that includes an ancestral species and all its descendants • Clades can be nested in larger clades, but not all groupings of organisms qualify as clades