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Dichotomous Keys

Dichotomous Keys. Biology 11 Ms. Lowrie. Dichotomous Keys. Tool used to name or identify unknown organisms “di” – two options. How to Use One. Read both statements Select either (a) or (b) Which describes the organism? Follow directions. Do you know your plants?. Norn Classification.

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Dichotomous Keys

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  1. Dichotomous Keys Biology 11 Ms. Lowrie

  2. Dichotomous Keys • Tool used to name or identify unknown organisms • “di” – two options

  3. How to Use One • Read both statements • Select either (a) or (b) • Which describes the organism? • Follow directions

  4. Do you know your plants?

  5. Norn Classification • Belong to genus Norno • Divided into eight species • Located in specific regions Task: • Use dichotomous key to identify • Write their scientific name (genus + species) on the blank

  6. How’d you do? • Norno Beverlus • Norno Dallus • Norno Rajus • Norno Kentuckyus • Norno Californius • Norno Wala Wala • Norno Dakotus • Norno Yorkio

  7. Whale Key (pg 332) • Identify each whale

  8. Answers • killer whale - Orcinus orca • humpback whale - Megaptera novaeangliae • Beluga - Delphinapterus leucas • narwhal - Mmnodon monoceros • sperm whale- Physeter macrocephalus • blue whale - Balaenoptera musculus • bowhead whale - Balaena mysticetus

  9. Analysis Questions • What are four characteristics used to classify whales? • Why might biologist use a key? (in general) • Provide an example of when a biologist might use a key to classify a whale? • Make a list of other characteristics that could be used to classify whales.

  10. Difficult with Odd Numbers • Immediately pick something out that’s different • Let’s make one together! • 3 hand sanitizers

  11. Questions???

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