Classification

1
Classification

• What things can you think of in your home that
  are organized or classified into specific groups?

2

• Classification is the process of grouping things
  based on their similarities.
• Biologist use classification to organize living
  things into groups so that the organisms are
  easier to study.
• Other scientists also classify things (Ex
  geologists classify rocks)

3
Levels of Classification

• Todays classification system uses 7 levels to
  classify organisms.
• The first group is the broadest level and the
  following levels all gradually become more
  specific.

4

• Kingdom
• Phylum
• Class
• Order
• Family
• Genus
• Species

5
Which level has the greatest number of organisms?

Kingdom
What other organism has the most similarities to
a grizzly bear?
Black bear
Which level has the least number of organisms?
Species
6

• Scientists use binomial nomenclature which is a 2
  part naming system.
• The first part of the scientific name is the
  genus.
• The second part of the scientific name is the
  species.
• Example Dendrobates auratus is the scientific
  name for the green and black poison dart frog

7

• What is the scientific name of a blue jay with
  the following classification
• Kingdom Animalia
• Phylum Chordata
• Class Aves
• Order Corvidae
• Genus Cyanocitta
• Species Cristata

8
Using a Dichotomous Key

• A dichotomous key is a device that describes the
  physical characteristics of an organism.

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1a. Bean round Garbanzo bean
1b. Bean elliptical or oblong Go to 2
     
2a. Bean white White northern
2b. Bean has dark pigments Go to 3
     
3a. Bean evenly pigmented Go to 4
3b. Bean pigmentation mottled Pinto bean
     
4a. Bean black Black bean
4b. Bean reddish-brown Kidney bean