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Why do we need classification??

Why do we need classification??. What is classification? To classify means to group similar things How do you use classification every day? Ex. Different places in the kitchen for plates, cups, silverware, etc… Everyone uses classification all the time, not just biologists. .

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Why do we need classification??

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  1. Why do we need classification??

  2. What is classification? • To classify means to group similar things • How do you use classification every day? • Ex. Different places in the kitchen for plates, cups, silverware, etc… • Everyone uses classification all the time, not just biologists.

  3. What is taxonomy? • Taxonomy is the science of classifying organisms • Which scientist invented our system of taxonomy we use today? • Carl Linnaeus! • It is called hierarchical classification • He used latin to describe species, which is what we still use today (that is why we italicize scientific names!)

  4. Linnaeus vs. Today • Linnaeus grouped plants based on reproductive characteristics • Now we group plants based on phylogeny • Phylogeny=Evolutionary history, or how the plants are related. • We use genetics to figure out how plants are related. • In Linnaeus’s day, scientists did not know what evolution was or what DNA and genetics was. • This is how science works!

  5. Hierarchical Classification • It starts very broad and gets more specific • 7 hierarchies in our system: • Kingdom Very broad • Phylum (Division) • Class • Order • Family • Genus • Species Very specific

  6. The 6 Kingdoms • Kingdoms are the largest division-all organisms are in one of the 6 kingdoms • Animals • Plants • Fungi • Protists • Eubacteria • Archaebacteria

  7. Let’s classify. . . • Here is the classification for a Lion • Kingdom: Animalia (animal kingdom) • Phylum: Chordata (Vertebrates) • Class: Mammalia (mammals) • Order: Carnivora (carnivores) • Family: Felidae (cats) • Genus: Panthera • Species: Panthera leo

  8. Dichotomous keys • What is a dichotomous key? • A step-by-step guide to identify an organism • Each step gives a choice of two descriptions. • The descriptions have to be opposites • Ex. Leaves round vs. leaves not round

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