EOC Review Cladograms and Phylogenetic Trees

Front

What is a cladogram?

Back

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.

Front

What is a phylogenetic tree?

Back

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

Front

What does a common ancestor mean?

Back

A common ancestor is an ancestral species from which two or more species have evolved.

Front

Which group of animals are most closely related to birds?

Back

Saurischian dinosaurs are most closely related to birds.

Front

What do all species on a cladogram have in common?

Back

All species on a cladogram share a common ancestor.

Front

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

Back

The least related organism is typically the one that branches off earliest from the common ancestor.

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

Back

Branching points represent common ancestors from which descendant species diverged.

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What does it mean if two species share a more recent common ancestor?

Back

It means that they are more closely related to each other than to species that share a more distant common ancestor.

Front

What is the role of traits in constructing a cladogram?

Back

Traits are used to determine the relationships between species; shared traits indicate a closer evolutionary relationship.

Front

What is the difference between Saurischian and Ornithischian dinosaurs?

Back

Saurischian dinosaurs are characterized by their lizard-like hips, while Ornithischian dinosaurs have bird-like hips.