BIOL 2061 Chapter Notes - Chapter 21.1-21.2: Carl Woese, Anagenesis, Cladogenesis
Introduction
• Taxonomy: Science of describing, naming and classifying species that still exist today as
well as species that have died out.
o Extant: species that still exist
o Extinct: species that have died out
• Systematics: study of biological diversity and evolutionary relationships among
organisms, both dead and alive
21.1 Taxonomy
• A hierarchy is a system of organization that classifies and entities into successive levels
• In biological taxonomy, every species is placed into several different nested groups
within a hierarchy
• Taxon/Taxa: each group at any level
• Carl Woese proposed the idea of domains
o 3 Domains
▪ Bacteria
▪ Archea
▪ Eukarya
•
• Supergroup: lies between a domain and a kingdom
• Domain > Supergroup > Kingdom > Phylum > Class > Order > Family > Genus >
Species
o Each one contains fewer species as you go along the line and they begin to have
more similar characteristics to one another
find more resources at oneclass.com
find more resources at oneclass.com
