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Taxonomy(Naming
and Grouping)
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Why is a naming system important?
Have you seen a… • Florida panther?• Cougar?• Mountain lion?• Catamount?• Puma?• They are all the
SAME animal!• Their difference
is their regional “common name”
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The origins of taxonomy
• Taxonomy → grouping and naming of organisms– to understand the variety of life– to avoid confusion of regional names
• Carl (Carolus) Linnaeus (1707-1778)– developed a binomial nomenclature (2-part
name), now called the scientific name– developed a 7-level (taxon) classification• (domain), kingdom, phylum, class, order,
family, genus, species– Dreaded King Philip Came Over For Great Spaghetti– Did King Philip Come Over From Glorious Spain?– Dumb Kids Playing Chicken On Freeways Go Splat
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The Three Domains(added in 1990)
(…eukaryotes)
(…”common” prokaryotes)
(…“ancient” prokaryotes)
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The scientific name is taken from the genus and species
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Taxonomic groups• Beginning with domain, each successive level of
classification becomes more specific
Members of a genus share more in common than members of a
family
• Organisms within the same group have more in common with one another than those within the next largest group
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Kingdoms and Domains
Bacteria EukaryaArchaea
Archaea Bacteria Protista Plantae Fungi Animalia
The Three Domains
The Six Kingdoms
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What is a Cladogram?• Cladogram →
diagram that shows evolutionary relationships between organisms
• Helps scientists understand how one lineage broke away from another in the course of evolution
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What is a Dichotomous Key?
• Dichotomous key → classification used to identify unknown organisms
• Based on visible similarities
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