Step-by-step tools using paired choices to identify organisms.
Each step gives two contrasting statements leading to a name or the next step. Use observable features. Good keys avoid features that vary with age or sex. Digital keys may use multiple-entry formats.
Keys must use clear, unambiguous characters. Test with several specimens. Photographic keys help in field use.
Key idea: a key leads to an identification by successive choices.
Step-by-step tools using paired choices to identify organisms.
Dichotomous Keys is one of the 52 topics in Taxonomy & Biodiversity. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Taxonomy, Molecular Systematics, Biodiversity.
A tree key could split on needle versus broad leaves.
Dichotomous Keys is a Beginner topic, so no earlier topic is required. Other Beginner topics in Taxonomy & Biodiversity that pair well with it include Taxonomy, Binomial Nomenclature, Taxonomic Hierarchy.
The closest topics to Dichotomous Keys are Taxonomy, Molecular Systematics, Biodiversity, Species. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Dichotomous Keys. To practise the whole of Taxonomy & Biodiversity, use the Taxonomy & Biodiversity quiz.
Dichotomous Keys: Step-by-step tools using paired choices to identify organisms. Taxonomy: The science of naming, describing and classifying organisms. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Taxonomy and explain the difference aloud. Finally, take the Taxonomy & Biodiversity quiz and come back to this page for any question you miss.
The science of naming, describing and classifying organisms.
🗂️ Taxonomy & BiodiversityUses DNA and protein sequences to infer relationships between organisms.
🗂️ Taxonomy & BiodiversityThe variety of life at the level of genes, species and ecosystems.
🗂️ Taxonomy & BiodiversityA basic unit of classification; organisms that can interbreed and produce fertile offspring.
🗂️ Taxonomy & Biodiversity