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Classification and the Kingdoms of Life Classification • There are 1.6 million types of plants and animals and 3-10 million organisms not identified • Need to organize information • Taxonomy – branch of biology that names and groups organisms according to their characteristics and evolutionary history Important People • Aristotle- classified based on qualities like shape, ability to do harm, whether they are air, land, or water dwellers • John Ray- defined species as organisms capable of interbreeding and producing fertile offspring. • Linnaeus- classified based on form and structure; came up with Binomial Nomenclature Binomial Nomenclature • Method of naming organisms by their genus and species. • Both genus and species are underlined or italicized. • Ex) Homo sapiens • Genus = Homo • Species = sapiens 7 levels of Classification • Kingdom • Phylum • Class • Family • Genus • Species King Phillip Came Over for good Modern Taxonomy • Based on evidence such as the fossil record, morphology, embryology, development and DNA evidence. • Phylogenetic Tree-(see ex. on slide) • Cladogram -(see ex. on slide) • Dichotomous Key- instrument used to identify an organism based on certain characteristics (if…then.…) Phylogenetic Tree- shows evolutionary relationship between organisms Cladogram- use shared derived characters that evolved within the group being studied The Six Kingdoms of Life • Organisms in each kingdom are similar in their cellular structure, methods of obtaining nutrients, and metabolism. • Archabacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia. The Beginning • It is thought that the 1st organisms on earth were bacteria (cyanobacteria) that produced all of the oxygen in the primitive atmosphere. • How were the first eukaryotes formed? –Endosymbiosis Theory Endosymbiotic Theory • Idea that larger prokaryotic (bacteria) cells engulfed other smaller prokaryotic cells. • The smaller prokaryotic cells became the organelles (like mitochondrion and chloroplasts) that helped the cells function and evolve into animal and plant cells Bacteria • Prokaryotic, unicellular, auto or heterotrophic • Autotrophs can get energy from sun (photosynthetic) or from inorganic substances (chemosyntheitic) • 2 types - Archeabacteria and Eubacteria Kingdom Archaebacteria • Prokaryotic, unicellular, auto or heterotrophic • usually live in harsh environments –oxygen free (anaerobic), very hot or acidic, or very salty environments • chemically different from other bact. –cell walls do not contain peptidoglycan 2) Kingdom Eubacteria • Prokaryotic, unicellular, auto and heterotrophic • “true” bacteria- can be found just about everywhere • Can be classified by shape, chemical composition, motility and metabolism Identify Bacteria –Shape • Bacillus = rod • coccus = sphere • spirilla = spiral - Arrangement - diplo = two - strepto = chain - staphylo = cluster • Eubacteria can cause animal and plant disease but can also be beneficial. • They are essential parts of the food and pharmaceutical industry and can even be used to clean up oil spills. 3) Protista • unicellular, some simple multicelluar, all eukaryotic (nucleus present) • Some live freely, others are parasites • “catch all” kingdom –Protozoan animal like (ameobas and paramecium) –Algea plant like –Slime Molds fungus like Protozoan • Animal-like protists • heterotrophs • Classification based on movement –Sarcodina (pseudopodia) –Mastigophora (flagella) –Ciliophora (cilia) –Sporozoan (spores) Algae • Plant-like Protist • major ancestor to plants (autotrophic) • capable of photosynthesis (contains chlorophyll)- major source of O2 on earth • Reproduce sexually (Alternation of Generations) • unicelluar, multicellular,or colonial • phytoplankton - food for marine animals Phylum Euglenophyta - Euglena Slime Molds • Fungus-like Protist • multinucleated • no cytokenesis • decomposers Slime mold 4) Fungus • Eukaryotic; multicelluar; heterotrophic • extracellular digestion- absorb nutrients • have sexual and asexual reproduction • have cell walls made of chitin 4 types of Fungi • Common Molds (Zygomycota)- ex. Breadmold • Club Fungi (Basidomycota)- ex. Mushrooms • Sac Fungi (Ascomycota)- ex. Yeast • Imperfect Fungi (Deuteromycota)ex. Penicillin, athletes foot, ringworm Uses • Useful –decomposersbreak down organic matter –antibiotics –industry - baking, brew, cheese –food - mushrooms, truffles • Harmful –spoiled food –plant/animal disease –ex. Dutch Elm Disease • parasite- tree diessaprophyte Basidiomycota - basidiocarp Ringworm 5) Plant Kingdom • Eukaryotic, multicellular, autotrophic • Take up water and nutrients in roots; make food in leaves (photosynthesis) • sexual reproduction (alternation of generations) Adaptations to Land • deciduous- trees that drop leaves- reduce dry out • seed/pollen- pollination • flowers and fruits- attract pollinators and fosters dispersal of seeds Adaptations to Land • Vascular system (veins or tubes)- plants can grow tall away from water –Leaves-photosynthesis (stomata control gas exchange) –stems- support leaves –roots (hairs) obtain water and anchor • xylem- moves water • phloem-moves food 6) Animalia Kingdom • Eukaryotic, multicellular, heterotroph • Specialized cells from into tissues and organs • Most are able to move (some are sessile) • Invertebrates (no spinal cord) or Vertebrate (spinal cord) Invertebrates • No backbone • Symmetry- irregular, radial, or bilateral • Most have exoskeleton (hard outer casing) • Ex.--Sponges, Cniderians, Worms, mollusks, Arthropods (insects, crustaceans, spiders), echinoderms Porifera (Sponges)- feeders, hermaphrodites, and bud, fragment, and regenerate Cnidarians (jelly fish, hydra)- sting prey with poisonous barbs in tentacles,, Sex/Asex, Medusa (free swimming) and Polyp (stuck to something) Platyhelminthes (flat worms)decomoposers, some parasitic,, hermaphrodites and regeneration Nematoda (round worms)- parasitic, 1st with one-way complete dig sys., not hermaphrodites (ex. Ascaris/ pinworm/ vinegar eels) Annelida (segmented worms)-ex. Earthworm-complete dig syst, hydroskeleton, (breath through skin), developed nervous sys, hermaphrodites Mollusk (slugs, snails, clams, squid, octopus)- complete dig sys, simple to complex nervous sys, internal fertilization, Arthropods (Crustaceans, Arachnids, Insects)- jointed appendages and body regions, exoskeleton, compound eyes, complete dig sys, nervous sys (brain) Echinoderms (starfish)- spiny skin, radial symmetry, endoskeleton, nervous sys, complete dig, separate sexes, can regenerate Vertebrates • Chordates- hollow nerve tube, notochord, gill slits, • vertebrae- bony segments (backbone) • distinct head (cephalization) • closed circulatory system • endoskeleton (axial and appendicular) • Ex: Fish, Amphibians, Reptiles, Birds, Mammals Fish- Agnatha (jawless), Chondricthyes (cartilogenous), Osteichthyes (boney), have 2 chambered heart, ectothermic Amphibians (frogs, toads, salamanders), aquatic larval stage, adapt to land, ectothermic, 3 chambered heart Reptiles (snakes, turtles, lizards, alligators)- 1st to have amniotic egg, skin covered with scales, ectothermic3 chambered heart Aves (Birds)-hollow bones (help fly), endothermic, 4 chambered heart) Mammals-covered with hair, nourish young with milk (mammary glands), endothermic, 4 chambered heart, Marsupials and Placental