Biologists use a system of classification to organize information about the diversity of living things.
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1 Section 1: Biologists use a system of classification to organize information about the diversity of living things. K What I Know W What I Want to Find Out L What I Learned
2 Essential Questions What are the similarities and differences between Aristotle s and Linnaeus s methods of classification? Using binomial nomenclature, how are scientific names written? What are the categories used in biological classification?
3 Vocabulary Review morphology New classification taxonomy binomial nomenclature taxon genus family order class phylum division kingdom domain
4 Early Systems of Classification Classification is the grouping of objects or organisms based on a set of criteria. Biologists use a system of classification to organize information about the diversity of living things.
5 Early Systems of Classification Aristotle s system More than 2,000 years ago, Greek philosopher Aristotle developed the first widely accepted classification system. Classified organisms as plants or animals Animals divided into red blooded and bloodless, then by habitat Plants divided by average size and structure
6 Early Systems of Classification Linnaeus s system Linnaeus s system of classification was based on observations of morphology and habitat. The Linnaean system was the first formal system of taxonomy the discipline of identifying, naming, and classifying organisms.
7 Early Systems of Classification Binomial nomenclature Linnaeus s method of naming organisms, called binomial nomenclature, gives each species a scientific name with two parts. The first part is the genus name, and the second part is the specific epithet, or specific name, that identifies the species. Biologists use scientific names for species because common names vary in their use.
8 Early Systems of Classification Binomial nomenclature When writing a scientific name, scientists use these rules: The first letter of the genus name always is capitalized, but the rest of the genus name and all letters of the specific epithet are lowercase. If a scientific name is written in a printed book or magazine, it should be italicized. When a scientific name is written by hand, both parts of the name should be underlined. After the scientific name has been written completely, the genus name will be abbreviated to the first letter in later appearances (e.g., C. cardinalis).
9 Early Systems of Classification Modern classification systems Modern classification is rooted in the Linnaean system. As the study of evolution grew, scientists began using evolutionary relationships in their classification systems.
10 Taxonomic Categories The taxonomic categories used by scientists are part of a nested-hierarchal system. Each category is contained within another, and they are arranged from broadest to most specific.
11 Taxonomic Categories Species and genus A named group of organisms is called a taxon. A genus is a group of species that are closely related and share a common ancestor. Family A family is the next higher taxon, consisting of similar, related genera.
12 Taxonomic Categories Higher taxa An order contains related families. A class contains related orders. A phylum or division contains related classes. A kingdom contains related phyla. The domain is the broadest of all the taxa and contains one or more kingdoms.
13 Systematics applications Taxonomy is part of a larger branch of biology called systematics. Systematics is the study of biological diversity with an emphasis on evolutionary history. Taxonomists can produce detailed guides to identify different organisms. Through the use of dichotomous keys, which provide a series of choices between alternate characteristics, users can identify organisms they encounter.
14 Review Essential Questions What are the similarities and differences between Aristotle s and Linnaeus s methods of classification? Using binomial nomenclature, how are scientific names written? What are the categories used in biological classification? Vocabulary classification taxonomy binomial nomenclature taxon genus family order class phylum division kingdom domain
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