Cladograms and Phylogenetic Trees

Front

What is a cladogram?

Back

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 does a phylogenetic tree represent?

Back

A phylogenetic tree represents the evolutionary history of a group of organisms, showing how they have diverged from common ancestors over time.

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What are derived characteristics?

Back

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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Why are advantageous traits more likely to be passed onto offspring?

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Because they are more likely to survive and reproduce.

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What does each node on a cladogram represent?

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Each node represents the last point at which two groups shared a common ancestor.

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What is the significance of branching points in a phylogenetic tree?

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Branching points represent common ancestors of the organisms that diverge from that point.

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How can you determine the most distantly related organism in a cladogram?

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The most distantly related organism is typically the one that branches off first from the common ancestor.

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What is a monophyletic group?

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A monophyletic group is a group of organisms that includes an ancestor and all of its descendants.

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What is the difference between homologous and analogous traits?

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Homologous traits are similar due to shared ancestry, while analogous traits are similar due to convergent evolution, not shared ancestry.

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What role do fossils play in constructing phylogenetic trees?

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Fossils provide evidence of past organisms and their characteristics, helping scientists determine evolutionary relationships.