Chapter 7 Classification – putting things into orderly groups based on similar characteristics.

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Presentation transcript:

Chapter 7 Classification – putting things into orderly groups based on similar characteristics

Why Classify ????? Makes it easier for biologists to answer How many species are there? What are the defining characteristics of each species? What are the relationships between these species?

Before 1600’s….. Scientists divided organisms into 2 groups: Plants Animals

1700’s…. Carolus Linnaeus – founded modern TAXONOMY Taxonomy – the science of describing, classifying, and naming living things

Classification Today….. 8 level system based on shared characteristics D,K,P,C,O,F,G,S

Branching Diagrams…..

Levels of Classification….. Kingdom (s) Phylum – Phyla Class(es) Order (s) Family – Families Genus – Genera Species

Two-Part Names….. Linnaeus gave each species a 2 part name Part One – Genus Name Part Two – Species Name Both are Italicized (or underlined) Part One is Capitalized Part Two is NOT capitalized

Binomial Nomenclature….. Human – Homo sapiens Asian Elephant – Elephas maximus Skunk - Mephitis mephitis Gray Wolf - Canis lupus Dog - Canis familiaris Cat – Felis catus

Dichotomous Keys….. Special identification aid that uses sequential pairs of descriptive statements