MICR 2123 Lecture 14: Origins and Evolution (3.9.17)
Document Summary
Phylogeny: natural history of an organism or taxonomic group. Taxonomy: the science of description, naming, and classification of organisms. Three domains of life: carl woese first used ssu rrna phylogeny to reveal the existence of a third kind of life: the. Archaea: the three fundamental groups of life-forms (bacteria, archaea, and eukarya) are termed domains, all living cells on earth share profound similarities. Important differences emerged between domains: each domain shoes distinctive traits that are absent or scarce in the other two. Classification and nomenclature: taxonomy: is the description of the distinct life-forms and their organization into different categories with shared traits, includes, classification: recognition of different classes of life, nomenclature: the naming of different classes. Identification: the recognition of the class of a given microbe isolated in pure culture: classification generates a hierarchy of taxa (groups of related organisms, levels of taxonomic hierarchy, domain, kingdom, phylum, class, order, family, genus, species.
