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The Linnaean System of Classification

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Presentation on theme: "The Linnaean System of Classification"— Presentation transcript:

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2 The Linnaean System of Classification
Grouped organisms by physical characteristics in nested hierarchies Kingdom Phylum Class Order Family Genus Species

3 Binomial Nomenclature
Two names Genus and species Better than a common name because it is always specific to a single species Ex: Homo sapiens Homo neaderthalensis Gorilla gorilla gorilla Bufo Bufo

4 How biologist classify living things
Physical characteristics – color, size, shape Genetic similarities and differences - DNA Fossil records of ancestors Embryological developement Goal: Classification mirrors evolutionary relationships

5 Annelids – Segmented Worms
Scientists used to think this was their closest relative Genetics and Embryology show this is their closest relative Arthropods Flatworms

6 Biological Classification
Domain - 3 Kingdom Phylum Class Order Family Genus Species - 2 million described, 5-20 million estimated The scientific name of a species is always its genus and species in italics Dear King Philip Came Over For Good Soup Dumb Kids Play Chicken On Freeway, Get Smushed

7 History of Kingdoms Linnaeaus – two kingdoms: Animalia and Plantae 1866 – Animalia, Plantae, Protista Animalia, Plantae, Protista, Monera Animalia, Plantae, Protista, Monera, Fungi Animalia, Plantae, Protista, Monera, Fungi, Archaea

8 Three Domains Bacteria – no nucleus
Archaea – no nucleus, different cell walls Eukarya – cells have a nucleus Animalia Plantae Fungi Protista

9 Classification of Humans
Domain: Eukarya Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primates Family: Hominidae Genus: Homo Species: Homo sapiens

10 P.O.D. – Are we as Eukaryotes more related to Bacteria or Archaea?

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