Classification of Living Things Ch. 18 Mrs. Griffin Before we begin…… What is the scientific name for the human species? • Homo sapiens What do you think the common names for Felis catus and Canis familiaris? • Cat, dog In each case, what does the first of the two names refer to? • The genus What do the two names together refer to? • The species Which group is more inclusive? • Genus. Before we begin… To study the diversity of life, biologists use a classification Vocabulary to know: system to name organisms and taxonomy, binomial group them in logical order. nomenclature, genus, taxon, family, order, The science of classifying class, phylum, kingdom, cladogram, organisms and assigning each the three domains and organism a universally six kingdoms. excepted name is known as taxonomy. One tool used to identify unfamiliar organisms is a dichotomous key…. Early classification systems “Oak with deeply divided leaves that have no hairs on their undersides and no teeth around their edges.” • Explained in great detail, very long. Carolus Linnaeus- Swedish botanist developed two-word naming system (binomial nomenclature). Linnaeus’s hierarchical system of classification included seven levels. From largest to smallest- kingdom, phylum, class, order, family, genus and species. Binomial Nomenclature Developed by Linnaeus Two-name system. The scientific name is always written in italics, the first word is capitalized, and the second word is lowercased. First name (genus); second name (species) Linnaeus’s system of classification Includes 7 levels: • Kingdom • Family • Phylum • Genus • Class • Species • Order Linnaeus’s system of classification, Figure 18-5 Does the coral snake belong in the Phylum Chordata and the Kingdom Animalia? • Yes Does the Albert Squirrel belong in the Family Ursidae? • No Remember- broad to specific (starting from the top down to the bottom). Classification using cladograms Points where characteristics arose. Characteristics that appear in recent parts of a lineage but not in its older members are called derived characteristics. These characteristics can be used to construct a cladogram. Kingdoms and Domains Let’s Review What is classification? Why is classifying living things important? What is taxonomy? Describe binomial nomenclature and how are scientific names written? Linnaeus’s hierarchical system of classification included seven levels, what are they?
Pages to are hidden for
"Classification of Living Things"Please download to view full document