17.1 the Linnaean System of Classification Linnaeus Developed the Scientific Naming System Still Used Today

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17.1 The Linnaean System of Classification Linnaeus developed the scientific naming system still used today. • Taxonomy is the science of naming and classifying organisms. White oak: Quercus alba • A taxon is a group of organisms in a classification system. 17.1 The Linnaean System of Classification Binomial nomenclature is a two-part scientific naming system. – uses Latin words – scientific names always written in italics – two parts are the genus name and species descriptor 17.1 The Linnaean System of Classification A genus includes one or more physically similar species. – Species in the same genus are thought to be closely related. – Genus name is always capitalized. • A species descriptor is the second part of a scientific name. – always lowercase Tyto alba – always follows genus name; never written alone 17.1 The Linnaean System of Classification • Scientific names help scientists to communicate. – Some species have very similar common names. – Some species have many common names. 17.1 The Linnaean System of Classification Linnaeus’ classification system has seven levels. • Each level is included in the level above it. • Levels get increasingly specific from kingdom to species. 17.1 The Linnaean System of Classification Grey wolf and coyote (top), golden jackal and Ethiopian wolf (bottom) 17.1 The Linnaean System of Classification The Linnaean classification system has limitations. • Linnaeus taxonomy doesn’t account for molecular evidence. – The technology didn’t exist during Linneaus’ time. – Linnaean system based only on physical similarities. 17.1 The Linnaean System of Classification Physical similarities are not always the result of close relationships. • Genetic similarities more accurately show evolutionary relationships. • This red panda is more closely related to the raccoon than to the giant panda. .

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