Chapter 18

1
Chapter 18 Classification

• 18.3 Building the Tree of Life

2
Three Domains

• DNA evidence proved that bacteria and archaea are
  very different so scientists created domains.
• Domains are a larger more inclusive taxon than a
  kingdom.
• Three domains of life

Three Domains Three Domains Three Domains
Bacteria Archaea Eukarya
Prokaryotic Prokaryotic Eukaryotic
3
Domain Archaea

• Members of the domain Archaea are
• unicellular and prokaryotic
• live in extreme environments
• The domain Archaea corresponds to the kingdom
  Archaea.

4
Domain Bacteria

• Members of the domain Bacteria are
• Unicellular
• Prokaryotic
• This domain corresponds to the kingdom
  Eubacteria.

5
Domain Eukarya

• The domain Eukarya consists of all organisms
  that
• Are eukaryotic (have a nucleus)
• Includes the kingdoms Protista, Fungi, Plantae,
  and Animalia.

6
Three Domains
7
Modern Day Kingdoms

• Six Kingdom system of classification
• Bacteria,
• Archaea
• Protista
• Fungi
• Plantae
• Animalia
• Two kingdom system during Linnaeus's time!
• Plant or Animal

8
Changing Ideas About Kingdoms

• Kingdoms have changes quite a bit overtime.

9
The Tree of All Life

• The tree of life represents the current
  hypotheses regarding evolutionary relationships
  among the taxa within the three domains of life.

10
The Tree of All Life

• Modern evolutionary classification is working
  towards the goal of presenting all life on a
  single evolutionary tree.
• The tree of life displays current evolutionary
  relationships among the taxa within the three
  domains of life.

11
The Tree of All Life