is based on structural similarities and differences, such as prokaryotic and eukaryotic cellular organization, and the way these organisms obtained their nutrition
Whittaker’s tree
Monera → Protists → Plants → Fungi → Animals
he devised a Three-Domain System of Classification
carl woese
Provides the accepted labels by which organisms are universally recognized.
International Code of Nomenclature of Bacteria (ICNB)
every organism is assigned a genus and a species of Latin or Greek derivation.
the first letter is always capitalized
genus
first letter is always lower case
species
relate to an organism’s genetic makeup, including the
nature of the organism’s genes and constituent nucleic
acids.
genotypic characteristic
are based on features beyond the genetic level and include both readily observable characteristics and characteristics that may require extensive analytic procedures to be detected.