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Definition
structures that have the same function, but not necessarily the same origin
ex: wings of a bird and bat |
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Definition
| derived characteristic diagnostic for a group |
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Term
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Definition
| on a phylogenetic tree, a link between 2 hypothetical ancestors or b/w a hypothetical ancestor and a species or group of species designated by a line |
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Term
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Definition
| a monophyletic grouping on a phylogenetic tree; a monophyletic subset on a phylogenetic tree |
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Term
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Definition
| the study of evolutionary relationships of organisms based on the rule of parsimony and that only monophyletic groupings deserve taxonomic status |
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Term
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Definition
structures that have the same origin, but not necessarily the same function.
ex: the arm of a human and the flipper of a dolphin |
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Term
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Definition
| a group containing all descendents of their most recent common ancestor; in cladistics, the only valid grouping |
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Term
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Definition
| on a phylogenetic tree, a hypothetical ancestory, the place where 2 branches intersect |
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Term
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Definition
a group not consisting of all the descendants of their most recent common ancestor
-in cladistics, this is an invalid grouping b/c it does not express evolutionary relationships |
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Term
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Definition
| The evolutionary history of a group of organisms |
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Term
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Definition
| branching diagrams that express evolutionary relationships |
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Term
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Definition
| a group consisting of 2 or more distantly related species; in cladistics, this is an invalid grouping b/c it does not express evolutionary relationships |
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Term
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Definition
| a species or clade most closely related to a given species; also called sisters |
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Definition
| shared ancestral/primitive characteristics |
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Definition
| shared derived characteristics |
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Term
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Definition
| any grouping in the Linnean heirarchy (genus, species, family...) |
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Term
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Definition
| the study of naming organisms (a subset of systematics) |
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