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TAMU MARB 435 - Phylogenetics
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Marb 435 1st Edition Lecture 2Outline of Current Lecture 1. This lecture will be covering phylogenetic and the founders of phylogenetic concepts as well as phylogenetic trees and character matrixes.Current Lecture: Phylogenetics- Charles Darwin was one of the first people to extensively study evolution. He studied the relations of many different species in the Galapagos Islands. His great work was known as The Origin of Species- Ernst Haeckel was a German zoologist, philosopher and artist who thought that humans had a special place in the “tree of life” He saw the tree of life more as how a tree actually looks than how we know trees of life today. He believed man had a place at the top of the tree of life- Willi Henning was German entomologist who is usually considered the founder of phylogenetic systematics, (also known as cladistics)- “Phylogenetic Systematics” was his published book that was first published in German inthe 1950s and translated into English in 1966- He believed that organisms shouldn’t be recognized and named unless their evolutionary history was a monophyletic group. This wasn’t widely accepted at first but now it is used in modern systematics.Terms to know: Phylogenetic Trees- Diagrams that indicate evolutionary relationships among taxa Speciation Events- are represented by the branching points of the tree  Characters- Structures to be compared among species are called Character States- Different versions of the characters Morphological Data-Anything you can see in an organism with or without microscopic techniques Parsimony- The simplest explanation is the most likely explanationThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Molecular Data-DNA (or protein) sequence data. Each nucleotide position is a character. DNA has four character states: ACGT Drosophila melanogaster – is an important fruit fly in evolutionary models Autopamorphy-Character state unique to a taxon, however it is phylogenetically uninformative Synapomorphy- Derived character state that is shared by all members of a group Paraphyletic Group –a group of species that does not include all descendants of an ancestral species Monophyletic group – a group of species that includes all descendants of a common ancestor Polyphyletic group- a group of species that has no direct common ancestor Clade – a clade is a monophyletic group that contains all descendants of a common ancestor Sister Taxa – Two branches that originate from the same node/branching


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