Lecture_4_Phylogenetics

Lecture_4_Phylogenetics - 6/15/2011 Phylogenies...

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6/15/2011 1 Phylogenetics LS1: Summer Session A June 27, 2011 Phylogenies Phylogeny is the evolutionary history of relationships between lineages of organisms Phylogenetic trees graphically depict these relationships Speciation and lineage formation Reproductive isolation between lineages leads to speciation The divergence of lineages can be reflected in the relative similarities and differences of the organisms in the lineage Lineage formation How to read a phylogenetic tree A group or organisms or species is referred to as a taxon A taxon that includes all of the evolutionary descendents of a single common ancestor is called a clade Two clades that are most closely related are referred to as sister clades All of life is evolutionarily related
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6/15/2011 2 Linneaus ’ system of taxonomy Swedish naturalist Carolus Linnaeus devised a classification system based on morphological similarities Binomial nomenclature Genus species Carolus Linnaeus (1707-1778) Binomial nomenclature Genus species Avoids confusion among common names Formalized process of naming governed by international naming commissions Fer-de-Lance Terciopelo Barba amarilla Cola blanca Bothrops asper The hierarchical organization of life Kingdom Phylum Class Order Family Genus Species
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This note was uploaded on 09/08/2011 for the course LS 1 taught by Professor Thomas during the Summer '05 term at UCLA.

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Lecture_4_Phylogenetics - 6/15/2011 Phylogenies...

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