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Classifications of living organisms (The Linnaean system divided living…
Classifications of living organisms
The Linnaean system divided living organisms based on Aristotle’s idea of the essential features of living things and on his logic.
Genus
Hominids with upright posture and large brains
Phylum
Animals with backbone
Class
Chordates with fur or hair and milk glands
Species
Member of the genus Homo with big forehead and thin skull bones
Family
Primates with flat faces and three dimensional vision
Order
Mammals with collar bones and grasping fingers
Kingdom
Animals: Organisms able to move on their own
Five kingdom classification
The main criteria for classification used by Whittaker include cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships.
Monera
Don’t have any clear membrane
They have celular body organization
Noncellulosic
Protista
Eukaryotic cell type
Their cell wall is present in some
They do have nuclear membrane
Celular body organization
Fungi
Eukaryotic cell type
Cell wall present without cellulose
Multicelular body organization
Plantae
Eukaryotic cell type
Present cell wall
They have organs
Animalia
Eukaryotic cell type
Absent cell type
They have organ systems
Three-domain system
This biological classification divided the celular life forms into:
Bacteria
They don’t have nuclear membrane
RNA markers from bacteria
Considered some of the oldest species in earth.
Eukaryiota
organisms whose cells contain a membrane-bound nucleus
They include non-microscopic organisms
Archaea
Cells with bacterial rRNA
No nuclear membrane
The Linnaean system