Biology: Systematics and Taxonomy

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Systematics

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The scientific study of the diversity of organisms and their evolutionary relationships.

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Taxonomy

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The branch of science concerned with classification, especially of organisms; involves naming and organizing species into a structured system.

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Phylogenetic Tree

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A diagram that represents evolutionary relationships among organisms; shows how different species or groups of species are related through common ancestry.

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Monophyletic

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A group of organisms that consists of all the descendants of a common ancestor.

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Polyphyletic

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A group of organisms that are grouped together but do not share an immediate common ancestor; often grouped based on similar traits rather than evolutionary history.

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Paraphyletic

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A group of organisms that includes a common ancestor but not all of its descendants.

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Relative Branching Order

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The sequence in which species or groups of species diverge from a common ancestor in a phylogenetic tree, indicating their relative evolutionary relationships.

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Doctrine of Signatures

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The historical belief that the physical form of a plant or organism resembles the body part or disease it could treat or was associated with.

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Linnaeus

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Carl Linnaeus, the scientist who developed the system of binomial nomenclature (two-part naming of species) and laid the foundation for modern taxonomy.

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Clade

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A group of organisms that consists of a single common ancestor and all its descendants, representing a branch on the tree of life.