Reading Cladograms and Phylogenetic Trees Review

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What is a cladogram?

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A cladogram is a diagram that shows the evolutionary relationships among various biological species based on similarities and differences in their physical or genetic characteristics.

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What is a phylogenetic tree?

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A phylogenetic tree is a branching diagram that represents the evolutionary history of a group of organisms, illustrating how they are related through common ancestors.

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What does a common ancestor represent in a cladogram?

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A common ancestor represents a species from which two or more descendant species have evolved.

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How can you determine the most closely related species on a cladogram?

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The most closely related species are found on branches that diverge from the same point on the cladogram.

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What does the length of branches in a phylogenetic tree indicate?

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The length of branches can indicate the amount of evolutionary change or the time since two species diverged from a common ancestor.

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What is the significance of point C in a cladogram?

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Point C represents the common ancestor of the alligator and T. rex, indicating their evolutionary relationship.

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How do you identify the most distantly related organism in a cladogram?

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The most distantly related organism is typically found at the end of the longest branch from the common ancestor.

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What is the role of traits in a cladogram?

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Traits are characteristics used to determine the relationships between species; they help to identify common ancestors.

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What does it mean if two species have a high number of differences in their amino acid sequences?

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A high number of differences suggests that the two species are less closely related and have diverged more in their evolutionary history.

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What is the relationship between Taxidea taxus and Lutra lutra?

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Lutra lutra is the species most closely related to Taxidea taxus, as indicated by their position on the cladogram.