Transcript Kingdoms and Domains Section 18-3

Kingdoms and Domains
Section 18-3
Objectives:
9.0 Differentiate between the previous fivekingdom and current six-kingdom classification
systems.
9.1 Sequencing taxa from most inclusive to least
inclusive in the classification of living things
Expansion of the “Tree of Life” (1950’s)
How many kingdoms did Linnaeus
name?
What were they?
Scientists soon realized
microorganisms, such as protists and
bacteria, did not belong in either of
those two kingdoms, so a 3rd kingdom
was created --- Protista. (Late 1800’s)
Next, Fungi: mushrooms, yeasts, and
molds
Monera: bacteria and other
prokaryotes
Six Kingdoms (1990’s)
Noted differences among
members of the Monera
kingdom led to dividing it into
two kingdoms: Eubacteria and
Archaebacteria.
Six Kingdoms: Eubacteria,
Archaebacteria, Protista, Fungi,
Plantae, and Animalia
Three Domains Classification
System
Based on comparative studies of a
small subunit of ribosomal RNA that
occurs in all living things.
Three domains:
1. Bacteria
2. Archaea
3. Eukarya
 What organisms do you think these
domains include?
Domain Bacteria
Unicellular
Prokaryotes
Cell walls contain peptidoglycan.
Corresponds to kingdom _____.
Domain Archaea
Unicellular
Prokaryotic
Live in Earth’s most extreme
environments
Cell membranes contain lipids
not found in any other
organisms
Correspond to kingdom _____.
Domain Eukarya
Contains ALL organisms that have a
nucleus!
What kingdoms would be included?
We can identify members of the
kingdoms Animalia, Plantae, and Fungi.
Kingdom Protista
 includes organisms with a nucleus, but
that cannot be classified as fungi, plants,
or animals.
 has the greatest variety of organisms.
Examining Diagrams and
Tables
Figures 18-11 and 18-12
summarize characteristics of
kingdoms and domains.
Figure 18-13:
What type of diagram does this
look like?
What do you think the big circle
with a “?” in it means?