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Chapter 18 Classification

What is the goal of biologists who classifiy living things?

Tammy Leonard

on 31 May 2011

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Transcript of Chapter 18 Classification

Why Classify Living Things?
What are the goals of biologists who classify living things? The National Science Foundation’s “Tree of Life” project estimates that there could be anywhere from 5 million to 100 million species on the planet, but science has only identified about 2 million To provide a Universal Scientific Name for each species
Why ? Show evolutionary relationships
Systematics Carolus Linnaeus 1730's
2 kingdoms (plants and animals)
Binomial Nomenclature
Genus species (underline or italics)Ex.1 Humans: Homo sapiens
Ex. 2 Ameoba: Chaos chaos
7 taxa (kingdom, phylum, class, order, family, genus & species. What does it mean to classify?

What things do you classify? History Cougar, Puma or Mountain Lion? Which is a fish? silverfish starfish jellyfish None of them ! Depends on
where you
are from! Modern Classification
based on evolutionary relationships
dna and protein comparisons
embryological similarity
cell structure
autotroph or heterotroph
photosynthetic or chemosynthetic Descendents of Common Ancestors

Monphyletic groups 3 Domains 6 Kingdoms Cladograms
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