Lecture 8

Lecture 8 - Bio 305 Jan 24th 08 Lecture 8 Phylogeny of the...

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Bio 305 Jan. 24 th 08 Lecture 8 Phylogeny of the Metazoa - Cuvier: pre-evol. days - Haekel: apply Darwin to phylogenies - Hyman - Pauling: molecular analysis into phylogenies Cuvier – 4 embranchements - radiata, mollusca, vetebrata, vermes (workms) Haekel - Does away with dividing by size or similarity but dividing by relatedness - Lineage projected forward in time (clade) o Monophyletic clade – all of group have an immediate ancestor in common o Paraphyletic – 2 ancestors back same o Polyphyletic – many ancestors back is same - Labeling tips and branches of the tree Phylogeny 2 objectives 1. understand how one kind animal evolves from another 2. To discover the relationships of kinds of animal - A kind is a phylum. A phylum represents animals having the same body plan. Haekel’s tree - as an evolutionary hypothesis – things getting more and more complex - as a phylogenetic hypothesis – relationship among animal groups 2 traditions - use A to derive B. Through morphology and development. Classical approach.
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Lecture 8 - Bio 305 Jan 24th 08 Lecture 8 Phylogeny of the...

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