Chapter 18 Classification
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1 Chapter 18 Classification
2 18.1 Finding Order in Diversity I. Assigning Scientific Names Common names confusing=varies w/lang & location Scientific name (latin) same worldwide The many names of Boletus edulis France: Cepe United States: King Bolete Italy: Porcini Puma Cougar Panther German y: Steinpilz England : Penny Bun Sweden : Stensop p Common names for a mountain lion: Poland: Borowik Finland: Herkkut atti Spanish: Rodelló n
3 Dichotomous key: guide to ID unknown org Uses paired statements with alternate choices
4 A. Binomial Nomenclature: 1. Linneaus (Swedish botanist) developed 2. 2-word naming system Genus species or Genus species Genus=type or group; species=unique description This poison arrow frog's scientific name, Dendrobates azureus, means blue tree-walker! The king vulture Sarcorhamphus papa has a scientific name that means "father or leader with a fleshy, curved beak." B. Classifying species into larger groups 1. Systematics: organizing life into meaningful groups 2. Taxa: biological groupings
5 II. Linnaean Classification System A. Uses 7 hierarchical, ordered ranks-taxa 1. Largest to smallest: Kingdom, phylum, class, order, family, genus, species
6 B. Problems with Traditional Classification 1. Used visible similarities/differences (barnacles look like limpets but are more like crabs) 2. Today: use evolutionary relationships Barnacle: crustacea Limpet: gastropod mollusk Crab: Crustacea
7 18.2 Modern Evolutionary Classification I. Evolutionary Classification Phylogeny: species grouped using evolutionary descent A. Common Ancestors: taxa groupings show relationships 1. Larger, more diverse taxa=more ancient common ancestor B. Clades-a monophyletic group: single common ancestor and all descendants (living & extinct)
8 II. Cladogram Cladistic analysis shows specific traits branch from comm ancestor Links groups showing evolutionary relationships A. Building Cladograms: branches (nodes) represent ancestral species splitting in 2 1. Each node=last point species above line shared com ancestor 2. Root of node=common ancestor of those more recent
9 B. Derived Characters: trait arising in most recent ancestor of lineage C. Losing Traits: tetrapods (4 limbs) include reptiles; snake still reptile D. Interpreting Cladogram: character positions reflects order they arose E. Clade vs Traditional grps: evol. links more accurate=clades connects all species back to original ancestor (dinosaurs/ birds/reptile)
10 III.DNA in Classfication A. Genes as Derived Characteristics 1. Gene homologies (similarities) determine evolutionry relationshps 2. Mutations=derived characteristisc 3. More recent commn ancestors = diffs in genes (more mutations in common) =>closer related
11 B. New Evolutionary Trees 1. DNA=more accurate evolutionary tree 2. American vulture looks like African vulture yet DNA & behavior more similar to stork (more recent comm ancestor) 3. Giant panda DNA more like bears; Red panda DNA more like racoons (Pandas now in different clades) African Vulture Amercan Vulture Giant Panda Raccoons Red pandas Giant pandas Bears Red Panda Stork Common Ancestor
12 18.3 Kingdoms (6) & Domains(3) I. Changing Ideas about Kingdoms A. W/diversity of life: science moved from Linnaeus s 2 kingdms to 5 B. Genetic data= bacteria Kingdom Monera divided into 2 C. Genome data=new taxonomic division: Domain (larger than kingdom); now have 3 Protista : so diverse, > than 1 comm ancestr=not true clade
13 II. The Tree of Life
14 A. Domain Bacteria 1. Kingdom Eubacteria 2. Characteristics: a) Unicellular b) Prokaryotic c) Thick Cell Wall Peptidoglycan d) Diverse (majority)
15 B. Domain Archaea 1. Kingdom Archaebacteria 2. Characteristics: a) Unicellular & anaerobic b) Prokaryotic c) Cell membranes contain unique lipids d) Extreme Env t
16 C. Domain Eukarya w/4 Kingdoms 1. Kingdom Protista a) Paraphyletic group (more than 1 com ancestor) b) Plant-like, fungus-like, animal-like members c) Now at least 5 clades d) Most single celled 2. Kingdom Fungi a) Feed on dead/decaying org. b) Cell walls contain chitin c) Digest externally d) Most multicellular
17 3. Kingdom Plantae a) Autotrophic=Photosynthesis b) Cell Wall (cellulose) c) All plants are sister group to red algae (protist) 4. Kingdom Animalia a) Multicellular/hetero b) No Cell Wall/Motile
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