| A | B |
|---|
| binomial nomenclature | classification system in which each species is assigned a two-part scientific name |
| genus | group of closely related species; the first part of the scientific name in binomial nomenclature |
| systematics | study of the diversity of life and the evolutionary relationships between organisms |
| taxon | group or level of organization into which organisms are classified |
| family | in classification, group or similar genera |
| order | in classification, a group of closely related families |
| class | in classifiaction, a group of closely related orders |
| phylum | in classification, a group of closely related classes |
| kingdom | largest and most inclusive group in Linnaean classification |
| phylogeny | the evolutionary history of a lineage |
| clade | evolutionary branch of a cladogram that includes a single ancestor and all its descendants |
| monophyletic group | group that consists of a single ancestral species and all its descendants and excludes any organisms that are not descended from that common ancestor |
| cladogram | diagram depicting patterns of shared characteristics among species |
| derived character | trait that appears in recent parts of a ineage,but ot in its older members |
| domain | larger, more inclusive taxonomic category than a kingdom |
| Bacteria | domain of unicellular prokaryotes that have cell walls containing pepitidoglycan; corresponds with the kingdom eubacteria |
| Archea | domain consisting of unicellular prokaryotes that have cell wallas that do not contain peptidoglycan; corresponds to the kingdom Archaebacterias |
| Eukarya | domain consisting of all organisms that have a nucleus; includes protists, plants, fungi, and animals |
