Classification Introduction

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Presentation transcript:

Classification Introduction S7L1a:Develop a dichotomous key S7L1b: Classify organisms based on physical characteristics

Evolution has lead to great diversity of life, therefore scientist must have a way to organize all of the diversity, but how?

Question to think about… If you go to the grocery store to buy some bread, where do you look? Explain how a grocery store is set up.

What is classification? The grouping similar items together

How does classification relate to life science? Today, scientist group all organisms based on similarities in both external and internal features. They use classification to determine an organism’s phylogeny

What is phylogeny? The evolutionary history of an organism, or how it has changed over time.

Similar to a grocery store…. You have the bread aisle (all the bread in the store) Then different types of bread (hotdog buns, hamburger buns, sandwich bread) Then a variety of the same types of bread (sandwich bread: white, wheat, crust-less, etc) Then specific names for the bread (Publix brand, Sara Lee, etc)

The modern classification systems has seven levels. Kingdom (Animal, Plant, Fungi, Protist, Eubacteria, Archaebacteria) LARGEST GROUP Phylum Class Order Family Genus Species (an organism’s specific name) SMALLEST GROUP

How do you determine species specific names? Binomial nomenclature  the two-word naming system used to name the various species. First word of the two-word system identifies the genus of the organism (group of similar species) The second name tells you something about the specific organism

What are tools for identifying organism’s scientific name? Dichotomous keys Detailed list of identifying characteristics that includes scientific names Arranged in steps with two descriptive statements at each step You always start with step one! As you answer one question, the key sends you to another step, and you continue the steps until you identify the organism's scientific name.

Dichotomous key example http://www.hort.uconn.edu/plants/keys/trees/treekey01.html http://www.mdsg.umd.edu/programs/education/interactive_lessons/key/student1.htm

Summary Create an acronym to help you remember seven categories of classification Example: Kings Play Chess On Funny Green Squares Kingdom Phylum Class Order Family Genus Species