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BIOLOGICAL CLASSIFICATION

BIOLOGICAL CLASSIFICATION. The purpose of biological classification is to Have a system of naming organisms that is accepted around the world. 2) Predict how living things are related to one another. History of classification.

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BIOLOGICAL CLASSIFICATION

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  1. BIOLOGICAL CLASSIFICATION The purpose of biological classification is to • Have a system of naming organisms that is accepted around the world. 2) Predict how living things are related to one another.

  2. History of classification • Aristotle: ~ 350 BC. Divided living things into two kingdoms: “animals” (things that move) and “plants” (things that don’t move. He further divided plants into three categories:

  3. Herbs: small tender plants • Shrubs: medium plants with many woody trunks c) Trees: large plants with one large trunk Aristotle also placed animals into three categories:

  4. Flying animals (birds, bugs, bats) • Swimming animals (fish, shellfish) • Crawling animals (land animals) What are some problems with Aristotle’s system?

  5. 1735: Karl Linné devised a naming system of binomial nomenclature. Every organism received a first name and a last name. Most of these came from Greek or Latin. First name: the genus (plural is genera) A genus is a group of very similar organisms.

  6. Last name is species. Two organisms are of the same species if They can mate and produce a fertile offspring. Example: The scientific name of a dog is Canis familiaris. This includes all breeds of domestic dogs. A wolf is Canis lupus. Same genus, different species.

  7. The scientific name is always underlined or written in italics. The genus is always capitalized, the species is never capitalized. Linné further grouped all living organisms into smaller categories:

  8. Kingdom: Today is based on 1) cell type and 2) nutrition The categories go from general (Kingdom) to specific (species). Animal: many cells, eating Plant: many cells, makes own food Fungus: many cells, absorbs nutrients Protist: one cell with nucleus Bacteria: one cell, no nucleus

  9. Classification continues as follows: Kingdom: animals Phylum: Vertebrates (animals with backbones) Class: Mammals (vertebrates that nurse young) Order: Carnivore (mammals that eat meat) Family: Felidae (cats) Genus: Panthera (large cats that don’t purr) Species: onca

  10. The scientific name of this organism is Panthera onca (jaguar) An effective classification system will allow scientists to determine if organisms are related and if so, to what degree.

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