Transcript 18.3 Kingdoms and Domains Updates to Linnaeus` System

18.3 Kingdoms and
Domains
Updates to Linnaeus’ System
a. Some organisms had to be reclassified as
we learned more
-Example: Sponges had to be reclassified
from plants to animals when microscopes
were used to see the type of cells they had.
b. Changed from 2 to 6 kingdoms.
-Linnaeus- 2 kingdoms (plants, animals)
-Now- 6 kingdoms!
Sponges
Organisms Classified Using
Five Characteristics:
1.
2.
3.
4.
5.
Cell Type- Prokaryote or Eukaryote
Cell Wall- Does it have one?
Body type- Unicellular or multicellular
Nutrition- Heterotroph or autotroph
Genetics-Similiarities in DNA.
Three Domains:
1.Bacteria-Unicellular prokaryotes that have a
strong cell wall and unique genetic system.
Same as the eubacteria kingdom.
2. Archaea-Unicellular prokaryotes that have
chemically unique cell walls. They live in
extreme environments. Same as the
Archeabacteria kingdom. BRAIN POP!
3. Eukarya-Organisms made up of eukaryotic
cells. (Plants, animals, fungi and protists).
Characteristics of Eukaryotes

Plants-Autotrophs (make their own food).
-Cell Walls (made of hard cellulose)
-Mostly multi-cellular
Characteristics of Eukaryotes

Animals-Heterotrophs (must consume food)
-No cell wals
-Multi-cellular
Characteristics of Eukaryotes

Fungi-Heterotrophs
-Cell wall (made of hard chitin)
-Mostly multi-cellular
Characteristics of Eukaryotes

Protista-The “left overs” kingdom
-Autotrophs or heterotrophs
-Cell wall or no cell wall
-Multi-cellular or uni-cellular

BRAIN POP II!