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Classification

Classification. grouping of different types of organisms based upon similarities in structure and evolutionary relationships . WHY CLASSIFY?. In order to more easily study the unity and diversity of living organisms in an organized manner, biologists classify organisms

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Classification

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  1. Classification grouping of different types of organisms based upon similarities in structure and evolutionary relationships

  2. WHY CLASSIFY? • In order to more easily study the unity and diversity of living organisms in an organized manner, biologists classify organisms • This means that they group organisms together based on their common characteristics • Physical structure is often the primary basis for biological classification

  3. Early classification Animals & Plants With the discovery of the MICROSCOPE in the 1600’s many new organisms were discovered This was the basis for the change in the classification system

  4. BIONOMIAL NOMENCLATURE • Carolus Linneaus devised binomial nomenclature • (2 names in Latin) Genus-Species • ex. scientific name of humans ..... Homo sapiens • Homo is the genus name .... sapiens is the species name • Both have to be printed in italics or underlined • -Genus is ALWAYS capitalized

  5. MODERN CLASSIFICATION SYSTEM: • KINGDOM • PHYLLUM • CLASS • ORDER • FAMILY • GENUS • SPECIES

  6. HOW TO REMEMBER THAT: • KING PHILIP CAME OVER FOR GOOD SOUP

  7. KINGDOMS: • The 6 Kingdom System is based on the following criteria: 1. Presence or absence of a nuclear membrane 2. Unicellularity versus multicellularity 3. Type of nutrition

  8. Archaebacteria • most primitive and often live in extreme environments • LIVE IN UNUSUALLY HARSH ENVIRONMENTS • unicellular and no nucleus • This is the Proposed 6th KINGDOM • There are 3 types: • salt loving, heat loving & methane loving

  9. Kingdom Monera • bacteria and blue green algae • have a primitive cell structure • no organized nucleus or nuclear membrane • Three basic types of bacteria • Coccus- • Baccillus- • Spirillum-

  10. Kingdom Protista • Predominately unicellular organisms with plant or animal-like characteristics • examples include protozoa and all algae except the blue-green • have a true nucleus and nuclear membrane • Classification of Protists:Most protozoa are motile (CAN MOVE) and are divided into phyla based on their means of LOCOMOTION

  11. Animal-like Protists • Often animal like Protists are called PROTOZOA • They can live in fresh or salt water, in the soil, or in the bodies of other organisms Plant-like Protists: • Plant-like Protists are commonly called ALGAE • They contain chloroplasts and are therefore AUTOTROPHIC

  12. Spirogyra • plant-like Protists that contains thread-like filaments of chloroplasts • They may reproduce asexually by MITOSIS or sexually by CONJUGATION

  13. Plant and Animal like Protists The Euglena: • exhibits both animal-like and Plant-like characteristics • contains chloroplasts, which are involved in PHOTOSYNTHESIS • contains a flagellum, which is used for LOCOMOTION • euglena may be autotrophic or heterotrophic depending on the environment • In a light environment euglena would be AUTOTROPHIC • In a dark environment the euglena would be HETEROTROPHIC

  14. KINGDOM FUNGI • examples include yeasts, molds, and mushrooms • cells are usually organized into branched, multinucleate filaments which absorb digested food from the external environment • Mushrooms are made up of a network of tubes called HYPHAE

  15. Kingdom Plantae • multicellular - possess chloroplasts and cell walls • make their own food - PHOTOSYNTHESIS • Reproduce sexually – can be asexual • Vascular plants are more advanced - they have evolved specialized tissues, xylem, which is involved in structural support and water conduction, and phloem, which functions in food conduction • Nonvascular plants are usually no more than an inch or two in height because they do not have adequate support, which is provided by vascular tissues to other plants, to grow bigger

  16. ONION CELLS FROM LAB – NOTE THE BOXY SHAPE OF PLANT CELLS & THE DISTINCT CELL WALL

  17. Kingdom Animalia • multi-cellular organisms which ingest their food – HETEROTROPHS • Reproduce sexually

  18. Viruses • not classified in a kingdom • contain genetic material (DNA) but lack cell structures • only carry on the life function of reproduction • They must have a host (another living organism) to be able to reproduce • This causes disease in the host (Ex: colds, rabies, AIDS, flu)

  19. Bacteriophages invade the host cell, take over the cell, and begin replicating viruses, eventually lysing or bursting the host cell, releasing the new viruses to infect additional cells Papillomavirus is a DNA virus that causes warts POLIO VIRUS

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