2 What is Classification?? Classification is the arrangement of organisms into orderly groups based on their similarities.Classification is also known as taxonomy.A person who identifies and names organisms is known as a Taxonomist.
3 Why do we Classify Organisms? To have accurate and universal names for organisms (regardless of what language you speak).Prevents the mis-naming of organisms (such as starfish and jelly fish which are not really fish!!
4 History of Classification - Boring old people, yeah!! Aristotle was the first official taxonomist 2000 years ago.He divided organisms into two categories - plants and animalsHe then subdivided them based on their habitat (land, sea, air),And by their morphology (the way they look).
5 Problems with Aristotle's System Species are not unchangingDid not account for evolutionary relationships among organismsSome organisms did not fit easilyFrogs live on land and in water
6 Carolus Linnaeus 18th century taxonomist Called the “Father of Taxonomy”Based his classification system on observable characteristics.Developed binomial nomenclature.
7 Binomial Nomenclature Two-Part naming system.First part GenusSecond part speciesIt is always in LatinCapitalize Genus but NOT speciesItalicize when typing; underline when writing.
8 Today’s Classification System Still uses all the things Aristotle and Linnaeus brought to the table.In addition, we now know about DNA!DNA allows us to examine how closely related organisms are to one another.
9 Taxonomic CategoriesTaxon (plural = taxa) is a category into which related organisms are placed.There is a hierarchy of 8 groups (taxa) from broadest to most specific.Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species