SCHOOLS OF SYSTEMATICS

SCHOOLS OF SYSTEMATICS - to the formation of descendant...

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SCHOOLS OF SYSTEMATICS First of three lectures on Systematics . We are following a natural progression from the variation and dynamics of genes within populations, to divergence of populations and speciation to systematics = the scientific study of the kinds and diversity of organisms and their relationships. A systematic or phylogenetic perspective on diversity of life itself follows logically from the fact that there is a phylogenetic tree that relates all organisms: from one generation to the next there is a pedigree that relates the parents to offspring. Within a population at any one time there is a complex pedigree or network of the ancestry of genes that describes who received what genes from whom. Among populations of a species there is a tree indicating which populations diverged from others and the sequence of branching events of population separation. At the species level, there is another tree of relationships that describes the sequence of branching events that led
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Unformatted text preview: to the formation of descendant from ancestral species. Thus, just as a kind of population thinking is required to appreciate the evolutionary significance of variation among individuals, a kind of tree thinking is required to appreciate the evolutionary significance of the history of ancestor-descendant relationships that unites all levels of organization: genes, individuals, populations, species, higher taxa. What are the goals of modern systematics? 1. Differentiate individual organisms and establish the basic units: species 2. to arrange these units in a logical hierarchy that permits easy and simple recognition in the basis of similarity = classification 3. to keep the details of 1 and 2 separate = nomenclature 4. determine the evolutionary (ancestor-descendant) relationships between all levels of the hierarchy = phylogeny ....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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