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York University (12,845)
Biology (1,015)
BIOL 1001 (162)
Tamara Kelly (110)
Chapter 19

chapter 19

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Department
Biology
Course
BIOL 1001
Professor
Tamara Kelly
Semester
Winter

Description
Chapter 19 Notes 192 Systematic BiologyAn Overview Systematic biology classification and taxonomy help us organize and understand information about the biological worldThe science of systematics the study of the diversity of life and its evolutionary relationships has two major goalsOne is to reconstruct the phylogeny or evolutionary history of a group of organisms presented as phylogenetic trees These are formal hypotheses identifying likely evolutionary relationships among species The second goal is taxonomy the identification and naming of species and their placement in a classification A classification is an arrangement of organisms into hierarchical groups that reflect their relatedness Classifications should mirror phylogenetic history and the adaptive radiation evolutionary history of the group of organisms in question 193 The Linnaean System of Classification Linnaeus described and named thousands of species on the basis of their similarities and differences He developed a taxonomic hierarchy for arranging organisms into ever more inclusive categories A family is a group of genera that closely resemble one anotherSimilar families are grouped into orders Similar orders are grouped into classesSimilar classes are grouped into phylaSimilar phyla are grouped into kingdoms All life on Earth is classified into three domains The organisms included within any category of the taxonomic hierarchy compromise a taxon Speciesgenusfamilyorderclassphylumkingdomdomain
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