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Chapter 26 Key Terms
Bio 311D - Zhao
14
Biology
Undergraduate 3
09/25/2011

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Term
Binomial
Definition
Each species has two unique names – hence
binomial. The genus and the species
Term
Clade
Definition
grouping that includes a common ancestor and all the
descendents (living and extinct) of that ancestor.
Term
Class
Definition
the level above the order
Term
Classification
Definition
the arrangement of organisms by
their physical similarities, which reflect historical and
evolutionary relationships
Term
Domain
Definition
the level above kingdom. The 3 domains are: archaea, bacteria, and eukarya
Term
Family
Definition
the category above genus
Term
Order
Definition
above family
Term
Phylogenetic tree
Definition
a branching diagram that represents a hypothesis about the evolutionary history of a group of organisms
Term
Phylogeny
Definition
The evolutionary history of a species or group of related species
Term
Phylum
Definition
the category above class
Term
Systematics
Definition
Field of biology that deals with the
diversity of life.
Term
Taxon
Definition
a unit at any level of classification
Term
Taxonomy
Definition
the science of describing, naming, and
classifying organisms
Term
Classifications order
Definition
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
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