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

2. Classification of Living Things

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

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

5. 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 :

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

11. 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

12. 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

18. 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

19. 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".

20. 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?