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Domains - PowerPoint PPT Presentation


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Domains. Broadest , most inclusive taxon Three domains 1. Archaea and 2.Eubacteria are unicellular prokaryotes (no nucleus or membrane-bound organelles) 3. Eukarya are more complex and have a nucleus and membrane-bound organelles.

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domains
Domains
  • Broadest, most inclusive taxon
  • Three domains
    • 1. Archaea and 2.Eubacteria are unicellular prokaryotes (no nucleus or membrane-bound organelles)
    • 3. Eukarya are more complex and have a nucleus and membrane-bound organelles
slide2

Archaea live in harsh environments and may represent the first cells to have evolved.

Sewage treatment plants, deep ocean vents, volcanoes, geysers, etc.

slide3

Eubacteria are present in almost all habitats on earth.

Live in the intestines of animals

Some bacteria cause disease but many act as decomposers and are important to the environment.

domain eukarya is divided into four kingdoms
Domain Eukarya is Divided into Four Kingdoms
  • Protista (protozoans, algae…)
  • Fungi (mushrooms, yeasts …)
  • Plantae (multicellular plants)
  • Animalia (multicellular animals)
protista
Most are unicellular

Some are multicellular

Some are autotrophic, while others are heterotrophic

Many members found in water environments.

Protista
fungi
Fungi
  • Multicellular, except yeast
  • Absorptive heterotrophs (digest food outside their body & then absorb it)
  • Cell walls made of chitin
plantae
Multicellular

Autotrophic

Absorb sunlight to make glucose – Photosynthesis

Cell walls made of cellulose

Plantae
animalia
Animalia
  • Multicellular
  • Ingestive heterotrophs (consume food & digest it inside their bodies)
  • Feed on plants or other animals
taxons
Taxons
  • Most genera contain a number of different species, with the exception of Homo that only contains modern humans
  • Classification is based on evolutionary relationships
basis for modern taxonomy
Basis for Modern Taxonomy
  • Homologous structures (same structure but performs different function)
  • Similar embryo development (embryo=organism in its earliest form of development)
  • Similarity in DNA, RNA, or amino acid sequence of Proteins
cladogram
Cladogram
  • Diagram showing how organisms are related based on shared, derived characteristics such as feathers, hair, or scales.
dichotomous keying
Dichotomous Keying
  • Used to identify organisms
  • Characteristics given in pairs
  • Read both characteristics and either identify the organism OR go to another set of characteristics
example of dichotomous key
1a Many Tentacles present – Go to 2

1b Few Tentacles present – Go to 3

2a Eight Tentacles – Octopus

2b More than 8 tentacles – 3

3a Tentacles hang down – go to 4

3b Tentacles upright–Sea Anemone

4a Balloon-shaped body–Jellyfish

4b Body NOT balloon-shaped – hydra

Example of Dichotomous Key