CLASSIFICATION. Why do we classify? Early Classification 2000 years ago, Greek and Chinese Scientists classified animals based on _______________ 350BC,

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Presentation transcript:

CLASSIFICATION

Why do we classify?

Early Classification 2000 years ago, Greek and Chinese Scientists classified animals based on _______________ 350BC, Aristotle came up with a more complicated system based on many things including _____________________________.

Taxonomy _____________________________________ _____________________________________ __ John Ray Biologist in the 1600s Placed organisms in a hierarchy based on categories and subcategories.

Father of _____________________ Carolus Linnaeus In the late 1700s catalogued plants and insects. Developed basis for modern taxonomy using Latin words to describe organisms. Why Latin?

Classification Keys Used to help identify organisms based on _____________________________________. To identify something, you decide which of the two descriptions fit. One description will lead to an ____________ ______________ and the other will lead to more ________________________________. You will continue doing that until you find the organism’s name.

Example: Dichotomous Key

Binomial System of Nomenclature Also known as the ______________________. Specific name of an organism using two Latin words. The first word is the ______________. It is capitalized and italicized/underlined. The second word is the ________________. It is lower case and italicized/underlined. Example: Humans = Homo sapiens *the genus and specific epithet make up the species name.

Larger Divisions of Classifications Each division is referred to as a “taxon”. Most General Most Specific

Specific names are important because…

Changes since Linnaeus’ time... Over 2.5 million organisms have been discovered. Better tools and methods. Based on evolution

FRIENDS Dichotomous Key 1(a) This person is a female. (b) This person is a male. Go to 2 Go to 3 2(a) They have blonde hair. (b) They don’t have blond hair. Go to 4 Monica 3(a) This person got married. (b) This person never got married. Go to 5 Joey 4(a) This person slept with Brad Pitt. (b) This person never slept with Brad Pitt. Rachel Phoebe 5(a) This person studied dinosaur bones. (b) This person never studied dinosaur bones. Ross Chandler