Unit III: Biological Evolution

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Presentation transcript:

Unit III: Biological Evolution Cladograms Unit III: Biological Evolution

Evolutionary Classification Phylogeny = the study of evolutionary relationships Biologists now group organisms into categories that represent evolutionary descent (and not just physical similarities) How would you classify a hyena? Would you group it with cats or dogs? Photo credit flickr: ibeatty

Derived Characters Characteristics that appear more recently in a group but are not seen in older organisms Derived characters are used to construct a CLADOGRAM • a diagram that shows evolutionary relationships

Cladograms A diagram that shows evolutionary relationships

HOW TO BUILD A CLADOGRAM Watch this animation on how to build a cladogram http://ccl.northwestern.edu/simevolution/obonu/cladograms/Open-This-File.swf

Check for Understanding A diagram that shows an evolutionary relationship is a ________________________ A characteristic that appears only in recent members is called a ________________ character The study of evolutionary relationships is called __________________________

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