1. What is a Dichotomous Key? S7L1. Students will investigate the diversity of living organisms and how they can be compared scientifically. a. Demonstrate the process for the development of a dichotomous key. b. Classify organisms based on physical characteristics using a dichotomous key of the six kingdom system (archaebacteria, eubacteria, protists, fungi, plants, and animals).

2. What is a Dichotomous key? Used to help identify known specimen Work by asking yes or no questions whose answers lead the reader to the correct taxa for the organism Each step has 2 choices Uses scientific names that are the same in every country

4. Dichotomous Keys 1a. Organism has 4 legsGo to # 2 1b. Organism has more than 4 legsGo to # 20 2a. Organism has a tailGo to # 3 2b. Organism has no tailGo to # 35 3a. Organism has stripesBengal Tiger 3b. Organism has no stripesAfrican Lion

5. Dichotomous Key Try this one: 1a. Organism walks on all 4 legs (quadruped)2 1b. Organism walks on 2 legs (biped)8 2a. Organism has visible fur3 2b. Organism has no visible fur20 3a. Organism lives in warm climates7 3b. Organism lives in cold climates4 4a. Organism has brown or black furUrsus americanus 4b. Organism has white furUrsus maritimus

9. What is a Dichotomous Key? What is the purpose of a dichotomous key? How do you read a dichotomous key? Each step has _______ choices What name is assigned to the new organism?