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Definition: Phylogenic classification relies upon ancestral relations among individuals in order to divide them up. Phenetic classifiation relies upon observed behavior and characteristics in order to divide them up. Because observable behavior and characteristics are so dependent upon inherited genetic information which is, in turn, passed along from ancestors to progeny, the two classification systems often produce very similar results. But they do not always do so because some similarities are analogous rather than homologous.
Cladistics relies upon phylogenic classification while evolutionary biology relies upon a combination of phylogenic an phenetic classifications.
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