Key Question. Why are organisms placed into different groups? w Initial Thoughts. w _____ .

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Classification of Living Things

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Classification of Living Things

Presentation transcript:

Key Question. Why are organisms placed into different groups? w Initial Thoughts. w ___________________________________ ______________________________.

Classification of Living Things

What is classification? w Classification is the grouping of living organisms according to similar structures and functions.

Early classification systems w Aristotle grouped animals according to the way they moved

The modern classification system : w Kingdom w Phylum w Class w Order w Family w Genus w Species Developed by Carolus Linnaeus Consists of 7 levels :

Helpful way to remember the 7 levels w King Philip Came Over For Grape Soda. w King Philip Came Over For Green Skittles.

Binomial Nomenclature w Developed by Carolus Linnaeus w Two-name system: First name is the organism’s genus Second name is the organism’s species

What rules are used to write scientific names? w The first letter of the genus is ALWAYS capitalized w The first letter of the species is NEVER capitalized w Scientific names of organisms are always italicized or underlined

Using the Classification System Field guides help identify organisms. -they highlight differences between similar organisms (like trees) Taxonomic Key (Dichotomous Key) -paired statements that describe the physical characteristics of different organisms

A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item. "Dichotomous" means "divided into two parts".

Taxonomic Key Activity w 1a Fruits occur singly Go to 3 w 1b Fruits occur in clusters of two or more Go to 2 w 2a Fruits are round Grapes w 2b Fruits are elongate Bananas w 3a Thick skin that separates easily from flesh Oranges w 3b Thin skin that adheres to flesh Go to 4 w 4a More than one seed per fruit Apples w 4b One seed per fruit Go to 5 w 5a Skin covered with velvety hairs Peaches w 5b Skin smooth, without hairs Plums What steps would you use to identify a peach?