feb 23, ch 26

feb 23, ch 26 - Family Tree of Life(phylogeny/evolutionary...

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“Family Tree” of Life (phylogeny/evolutionary tree) o In chapter 26 Archaea and Bacteria were originally called Kingdom Monera Linnaeaus convinced us to use a hierarchical classification system; Darwin provided…. Get this Macro-evolultion and phylogeny o Phylogenetic tree – hypothesized genealogy traced back to the last common ancestor (i.e. the most recent) through hierarchical, dichotomous branching o Cladistics – the principles that guide the production of phylogenetic trees, aka cladograms (another word for phylogenetic tree) o These trees can be called phylogeny, cladogram, or phylogenetic tree o Lineage or Clade – an entire branch o A clade is a monophyletic group, i.e., an ancestral species and all of its descendents o A paraphyletic group consists of an ancestor and some of its descendents o A polyphyletic group lacks the common ancestor of species in the group o Taxonomic groups often reflect true clades… Domain Eukarya is a monothyletic group o However, tension sometimes exists between taxonomic tradition and cladistic hypotheses. Ex: if the class reptilian is to be monophyletic, birds must be included! o
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This note was uploaded on 08/29/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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feb 23, ch 26 - Family Tree of Life(phylogeny/evolutionary...

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