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Modern Evolutionary Classification
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Learning Targets“I Can…”
• Define a “cladogram.”• -Define a “derived character.” • -Interpret a cladogram.• -Create a cladogram to show evolutionary
relationships among species.• -Explain how the nodes on a cladogram
indicate evolutionary relatedness among species.
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History of Classification
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History of Classification
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Evolutionary Classification
• Because there are limitations to Linnaeus’ method of classification, scientists today try to assign species to a larger group that reflect how closely members of those groups are related to each other
• Modern classification is based on Charles Darwin’s ideas of evolutionary relationships
• Modern classification has led to phylogeny, which is the study of how living and extinct organisms are related to each other
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Cladograms
What information can be gained from these diagrams?
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Cladograms
• A cladogram links groups of organisms by showing how evolutionary lines, or lineages, branched off from common ancestors.
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Cladograms
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Cladogram Analysis
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Cladograms
Cladograms can be based on morphological features (how species look) or molecular (what species are made of)