tracing speciation · tracing speciation 1. phylogenetic tree –evolutionary relationships among...
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Tracing Speciation
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Tracing Speciation 1. Phylogenetic Tree –evolutionary relationships among various biological species or other entities
2. Cladogram- A clade is a grouping that includes a common ancestor and all the descendants (living and extinct) of that ancestor.
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Reading Cladograms
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Extinction• The lengths of the branches
have been adjusted to show when lineages split and went extinct.
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If you were to add a trout to the phylogeny shown above, where would its lineage attach to the rest of the tree?
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Constructing Cladogram Practice
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Constructing Cladogram Practice
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Analyzing Gene Sequences
• Which ones are more similar/less similar to one another
• Calculate the percentage similarity by dividing the number of matching sequence bases by the total number compared.
• Construct cladogram with data given • Organism A Sequence: ATGATCCAGT
• Organism B Sequence: ACGACTCAGT
• Organism C Sequence: TTGATCCAGT
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Practice Making Cladograms• Download document “Making Cladograms”
• 30 minutes to complete
• Found under “Evolution” Section
• Will be required to build a cladogram based upon characteristics shared.
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