Classification Slides

Classification Slides - .- The groups in a cladogram are...

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Some comments about classifying organisms 1. Traditional taxonomy is based primarily on anatomical characteristics. - It gives no information about how the organisms are related. - There is no definition for the groupings (class, family etc.).
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2. Phylogenetic systematics (cladistics) is based on the branching sequences of evolution. - A phylogenetic (or evolutionary) lineage originating from a common ancestor and including all of the descendants is a clade
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Unformatted text preview: .- The groups in a cladogram are related by derived characteristics .- Derived characteristics shared by two or more taxa are called synapomorphies .- The groups are nested and trace the evolutionary history Fig. 34.2- Phylogeny of chordates showing the major clades- Clades are nested Fig. 34.24 Anapsids X X Turtles Tuatara Snakes & lizards Crocodiles Birds Mammals Synapsids Diapsids Amniotic egg Anapsids ? Archosaurs Lepidosaurs Reptilia...
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Classification Slides - .- The groups in a cladogram are...

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