Which of the following statements is true about a phylogeny,as represented by a phylogenetic tree?

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The ancestral group in a phylogeny is often identified by out-group analysis, where a closely related group outside the group of interest is used as a reference to infer the ancestral state. Choices A and B are both false. Descendant groups from the same node necessarily share derived characters, and a monophyletic group must be based on synapomorphies (shared, derived characters inherited from a common ancestor).

Which of the Following Statements Is True About a Phylogeny,as