Classification and Taxonomy
Organisms are grouped from domain to species.
About this topic
Taxonomy groups organisms by shared features and evolutionary relationships. The hierarchy from broadest to narrowest is Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species. Linnaeus introduced binomial nomenclature: the genus and species names, in italics, like Homo sapiens.
The three domains are Bacteria, Archaea and Eukarya; kingdoms include animals, plants, fungi and protists. Modern classification uses DNA evidence, and dichotomous keys help identify organisms. A species is a group that can interbreed to produce fertile offspring.
A memory aid is King Philip Came Over For Good Soup. The human is Domain Eukarya, Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Primates, Family Hominidae, Genus Homo, species sapiens. Scientific names are written in italics with the genus capitalised, and are used worldwide so scientists avoid confusion over common names, such as puma, cougar and mountain lion.
Modern classification increasingly uses DNA sequences, which sometimes reveal that animals that look alike are not closely related. Carl Woese proposed the three domains, Bacteria, Archaea and Eukarya, after studying ribosomal RNA. A common error is thinking species always look different; some look identical but cannot interbreed, and some look different but can.
Key ideas
- Domain, kingdom, phylum, class, order, family, genus, species
- Binomial names
- Linnaeus
Quick check
Use cases: where Classification and Taxonomy helps
- Homework: review the key idea behind Classification and Taxonomy before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Classification and Taxonomy without notes.
- Visual learning: play with the interactive lab to see how Classification and Taxonomy changes when you adjust its inputs.
- Teaching a friend: explain Classification and Taxonomy in your own words, then compare your version with the key ideas.
Biology underpins medicine, farming, conservation and biotechnology.
Frequently asked questions
What is Classification and Taxonomy?
Organisms are grouped from domain to species.
What will I learn in Classification and Taxonomy?
Domain, kingdom, phylum, class, order, family, genus, species. Binomial names. Linnaeus.
Is Classification and Taxonomy part of Biology?
Yes. It is one of 150 Biology topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Classification and Taxonomy lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Classification and Taxonomy?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.