Classification

Cards (26)

  • What should you be able to do by the end of this video according to the introduction?
    Describe classification, the three-domain system, and use evolutionary trees
  • Why did scientists start classifying organisms as more species were discovered?
    They had characteristics in common
  • Which scientist began to classify species into different categories in the 1700s?
    Carl Linnaeus
  • What is the classification system developed by Linnaeus based on?
    Structure and characteristics
  • According to Linnaeus, how were all living organisms initially divided?
    Into two kingdoms
  • What are the two kingdoms Linnaeus divided all living organisms into?
    Animal and plant
  • What are the categories in Linnaeus's classification system?
    • Kingdom
    • Phylum
    • Class
    • Order
    • Family
    • Genus
    • Species
  • What mnemonic can be used to remember the order of Linnaeus's classification system?
    King Phillip came over for good soup
  • In the Linnaean system, what classification level is missing from this list: Kingdom, Phylum, Order, Family, Genus, Species?
    Class
  • How is every organism named?
    From their genus and species
  • What name is given to the naming system using the genus and species?
    Binomial system
  • What does the word "binomial" mean?
    Two names
  • What is the binomial name for the polar bear given the classification of genus Ursus and species maritimus?
    Ursus maritimus
  • What is the key fact about the Linnaean classification system?
    It's based on visible characteristics
  • How have major advances in biology affected the classification system?
    We can now analyze biochemistry
  • What system do scientists use now which involves analyzing biochemistry?
    The three domain system
  • Which scientist developed the three-domain system by comparing the biochemistry of organisms?
    Carl Woese
  • What are the three domains in the three-domain system?
    Archaea, bacteria, and eukaryota
  • What characterizes the Archaea domain?
    Primitive bacteria found in extreme conditions
  • What characterizes the Bacteria domain?
    True bacteria in many environments
  • What does the Eukaryota domain include?
    Animals, plants, fungi, and protists
  • How do scientists use evolutionary trees?
    To show relatedness of organisms
  • What data do scientists use to make evolutionary trees for living organisms?
    Classification data and DNA
  • What data do scientists use to make evolutionary trees for extinct organisms?
    Fossils
  • Why can using fossils be a problem when constructing evolutionary trees?
    Fossil records can be incomplete
  • According to the video, if species one and two are closely related and species three is more distantly related, what do all three share?
    A common ancestor