IndietroBuilding Phylogenetic Trees definitions
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1/15IndietroSkip to main contentIndietroPhylogenetic Tree
Diagram showing evolutionary relationships among organisms, with branches representing lineage splits based on shared traits. Shared Derived Character
Trait present in multiple taxa but absent in the outgroup, indicating recent common ancestry within the group. Shared Ancestral Character
Trait inherited from a distant ancestor, present in both ingroup and outgroup, offering little insight into recent relationships. Character Matrix
Table listing taxa and their traits, used to identify patterns of shared derived characters for tree construction. Ingroup
Set of taxa under study whose evolutionary relationships are being determined within a phylogenetic analysis. Outgroup
Taxon outside the ingroup, used as a reference point to distinguish ancestral from derived traits. Homologous Trait
Feature inherited from a common ancestor, supporting evolutionary connections among taxa. Analogous Trait
Feature with similar function or appearance in different taxa, not inherited from a common ancestor. Parsimony
Principle favoring the simplest evolutionary explanation with the fewest character state changes. Sister Taxa
Two groups sharing the most recent common ancestor, identified by the highest number of shared derived traits. Root
Base of a phylogenetic tree, representing the most recent common ancestor of all included taxa. Character State
Specific form or condition of a trait, such as presence or absence, used to compare taxa. Maximum Likelihood
Statistical method evaluating which evolutionary tree is most probable, considering the likelihood of different changes. Node
Branching point on a phylogenetic tree, representing a common ancestor from which descendant taxa diverge. Taxon
Any named group of organisms, such as species or families, used in phylogenetic analysis.
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