Phylogeny.

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Presentation transcript:

Phylogeny

Phylogeny The evolutionary history of a group of organisms A phylogenetic tree is used to show the evolutionary relationships among groups of organisms The base of the tree represents the oldest common ancester The tips of the tree represent the present-day species Forks represent the points at which an ancestral species split into two species

Leopard American badger European otter Coyote Gray Wolf

Types of evidence used in creating phylogenic trees: Anatomy (e.g. fossils) Development (e.g. early embryonic development) Biochemistry (e.g. protein analysis) DNA (e.g. nucleotide sequencing) Homologous features

Homework P. 409 #1-4, 7,11,12,15 Diversity Stations Refeference p. 412-508 Insect Assignment (Mon. Sept 26) Study for Taxonomy Quiz (Wednesday)

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