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 based on shared 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 ancestry.

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What does it mean for species to be closely related?

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Species that are closely related share a more recent common ancestor and have fewer genetic differences.

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What is the significance of amino acid similarities in cladograms?

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Amino acid similarities help determine the evolutionary relationships between species, as closely related species tend to have more similar amino acid sequences.

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

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The least related species are those that are furthest apart on the tree, indicating they share a more distant common ancestor.

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What are the main differences between arthropods and mollusks?

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Arthropods have jointed limbs and an exoskeleton, while mollusks typically have a soft body and may have a hard shell.

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What trait distinguishes sharks from ray-finned fish?

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Sharks have a cartilaginous skeleton, while ray-finned fish have a bony skeleton.

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What is genetic divergence?

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Genetic divergence refers to the process by which two or more species become more genetically different over time, often due to different evolutionary pressures.

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What is a common ancestor?

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

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What role do traits play in cladistics?

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Traits are used to group organisms in cladistics, helping to determine evolutionary relationships based on shared characteristics.