Taxonomy
Biological taxonomy is a branch of scientific research concerned with grouping, classifying, and naming different species of organisms. Somewhat ironically, there are different types and schools of taxonomy. Listed below are a few examples:
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Phenetics (or 'taximetrics'); seeks to relate species by overall appearance or morphology and takes a numerical approach to build relational information.
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Cladistics relates organisms by shared and lost ancestral traits
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Phylogenetics takes a genetic approach to identifying ancestral relationships based on shared gene code, polymorphisms, and gene products.