01:119:115 Lecture Notes - Prophage, Dna Virus, Lysis

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19:1: a virus consists of nucleic acid surrounded by a protein coat. Phylogeny: is the evolutionary history of as species or group of related species produced using systematic, the collection of fossils, molecular, and genetic data to infer evolutionary relationships a. Hierarchical classification: linneaus introduced system for grouping species in increasingly broad categories, taxonomic groups: domain, kingdom, phylum, class, order, family, genus, species. From two kingdoms to three domains: early taxonomists classifies all species as either plants or animals, later 5 kingdoms were organized: monera(prokaryotes), protista, plantae, fungi, and animalia, more recently, the three-domain system has been adopted: The thee-domain system is supported by data from sequenced genomes. Horizontal gene transfer: is the movement of genes from one genome to another. Horizontal gene transfer occurs by exchange of transportable elements and plasmids, viral infection, and fusion of organisms: so horizontal gene transfer complicates efforts to build a tree of life.

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