Science Video Of The Day: What Is Taxonomy?
Hi, Iâ€™m Emerald Robinson, and in this â€śWhat Isâ€ť video, weâ€™re going to discuss â€śTaxonomy.â€ť
Taxonomy is a system that biologists use to group organisms based on similar characteristics. Taxonomy is based on a concept called â€śhomology,â€ť shared characteristics that have been passed down, from a common ancestor.
Although humans have been classifying organisms by various methods since ancient times, Swedish biologist Carolus Linnaeus is considered to be the â€śfather of modern taxonomyâ€ť. His most famous work, Systema Naturae, established a system we still used today to determine an organismâ€™s scientific name. This system is called binomial nomenclature.
To understand what makes up the binomial nomenclature, we need to start at the top. Classic biological taxonomy usually places an organism into one of five kingdoms: bacteria, protists, plants, fungi, or animals. Each organism is then classified into the following groups: phylum, class, order, family, genus, and species. It is the genus and species that make up an organismâ€™s scientific name. For example, the scientific name for humans is Homo sapiens, where â€śHomoâ€ť is the genus, and â€śsapiensâ€ť the species.
Sometimes scientists classify organisms using a three â€śdomainâ€ť system. The three currently accepted domains are:
Archaea, single-celled microorganisms, that tend to live in extreme environments like very high heat or salt concentration;
Bacteria, which are abundant and live in most habitats on Earth, and
Eukaryotes, any organism made of cells which contain a membrane-bound nucleus.
Although we used to classify organisms based on characteristics that could be seen by the naked eye or under a microscope, today we commonly rely on analyzing an organismâ€™s DNA instead.
Scientists will continue to use these means to classify the approximately 15,000 new species that are identified each year.