Biology ch 18 - Kendall Todd Biology 1002 January 17, 2007...

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Kendall Todd Biology 1002 January 17, 2007 Chapter 18 Systematics: Seeking Order Amidst Diversity Biodiversity How many species exist? -1.5 million species categorized -up to 30 million to 100 million species may exist -7000 to 10000 new species described/year This is an overwhelming number of organisms that need to be classified Q-Most species recognized and described by biologist are animals from temperate regions. Why? A- there are more biologist interested in studying animals than studying other organisms and Animals in temperate regions are larger and easier to find than are other organisms. How are Organisms Named and Classified? Systematics -the science of reconstructing phylogeny or evolutionary relationships -Sytematists name organisms and place them into categories based on their evolutionary relationships Taxonomic Principles Taxonomic categories form and increasingly inclusive nested hierarchy -Domain, kingdom, phylum, class, order, family , genus and species -Domain-most inclusive
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Biology ch 18 - Kendall Todd Biology 1002 January 17, 2007...

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