Chapter 26 - CH 26 PHYLOGENY AND THE TREE OF LIFE...

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CH 26: PHYLOGENY AND THE TREE OF LIFE INVESTIGATING THE “TREE OF LIFE” The study of evolutionary biology investigates (1) the processes of evolution, such as natural selection (2) the history of life on Earth. Phylogeny traces the evolutionary history of a species, which involves examination of the fossil record, homologies and analogies. Systematics is an analytical approach to understanding diversity as well as the relationships among organisms. It is a system for classifying organisms and determining their evolutionary relationships. 26.1PHYLOGENIES SHOW EVOLUTIONARY RELATIONSHIPS These systems are used in taxonomy today: (1) classical evolutionary systematics (2) cladistics The Linnean system of classification is still being used, but it is being modified – modernized, if you will – to keep up with technological changes in the field of evolutionary biology and taxonomy. Taxonomy Binomial Nomenclature Species Epithet Linnean System Taxon (Pl: Taxa) Domains Phylogeny Phylogenetic Tree Dichotomies Sister Taxa Polytomy “Phylocode” 26.2PHYLOGENIES ARE INFERRED FROM MORPHOLOGICAL AND MOLECULAR DATA
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Chapter 26 - CH 26 PHYLOGENY AND THE TREE OF LIFE...

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