classification. why do we classify? early classification 2000 years ago, greek and chinese...
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 RayBiologist in the 1600sPlaced 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 2Go to 3
2 (a) They have blonde hair.(b) They don’t have blond hair.
Go to 4Monica
3 (a) This person got married.(b) This person never got married.
Go to 5Joey
4 (a) This person slept with Brad Pitt.(b) This person never slept with Brad Pitt.
RachelPhoebe
5 (a) This person studied dinosaur bones.(b) This person never studied dinosaur bones.
RossChandler