EOC Review Cladograms and Phylogenetic Trees

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What is a cladogram?

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A cladogram is a diagram that shows the evolutionary relationships among a group of organisms, illustrating how they are related through common ancestors.

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What are derived characteristics?

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Derived characteristics are traits that are present in an organism but were absent in the last common ancestor of the group being studied.

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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, showing how they have diverged from common ancestors over time.

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What does it mean for two species to be closely related?

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Two species are considered closely related if they share a recent common ancestor and have similar derived characteristics.

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What is the significance of Point C in a phylogenetic tree?

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

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Which group of dinosaurs is most closely related to birds?

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Saurischian dinosaurs are the group most closely related to birds, as they share a more recent common ancestor.

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What traits do salamanders and lizards share?

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Salamanders and lizards share jaws and lungs as derived characteristics.

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What is the purpose of a cladogram in evolutionary biology?

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The purpose of a cladogram is to hypothesize the order of descent of organisms from a common ancestor based on shared derived characteristics.

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How can you determine the least related organism in a phylogenetic tree?

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The least related organism is typically the one that diverged earliest from the common ancestor of the group being studied.

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What is the role of common ancestors in cladistics?

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Common ancestors are crucial in cladistics as they provide a reference point for understanding the evolutionary relationships and divergence of species.