Cladograms & 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 species are related through common ancestry.

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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 is a dichotomous key?

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A dichotomous key is a tool that allows the identification of organisms by answering a series of questions that lead the user to the correct name of a given item.

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What are homologous structures?

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Homologous structures are anatomical features in different species that share a common ancestry, even if they have different functions.

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What are analogous structures?

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Analogous structures are features in different species that serve similar functions but do not share a common ancestry.

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What are vestigial structures?

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Vestigial structures are remnants of organs or structures that had a function in an early ancestor but are no longer functional in the current organism.

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What is biochemical evidence in phylogenetics?

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Biochemical evidence refers to the analysis of DNA, RNA, and protein sequences to determine evolutionary relationships among organisms.

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How do you determine the closest relatives on a cladogram?

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The closest relatives on a cladogram are determined by the most recent common ancestor shared by the organisms, indicated by the branching points.

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What does it mean if two organisms have very similar DNA sequences?

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If two organisms have very similar DNA sequences, it indicates that they are closely related and likely share a recent common ancestor.

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

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Branching points in a phylogenetic tree represent common ancestors from which different species have evolved.