CLASSIFICATION Why Classification? * Study the diversity of life * Group and name organisms in a logical manner Taxonomy: science of classifying living.

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Presentation transcript:

CLASSIFICATION Why Classification? * Study the diversity of life * Group and name organisms in a logical manner Taxonomy: science of classifying living things and creating scientific names.

Early Classification Aristotle: 350 B.C. * Greek philosopher who classified organisms into two kingdoms: Plants or Animals Plants: size and structures Animals: behavior and habitat * What might be some problems with his system?

Video Clip

Linneaus: Mid 1700s: developed a new classification system His system grouped organisms based on morphology (physical appearance) Created 7 taxonomic levels Carolus Linnaeus ( )

Linnaeus’ Taxonomic levels 7 taxonomic levels (taxon=category) : Kingdom, Phylum, Class, Order, Family, Genus, Species Phrase to remember order of levels: King Phil Came Over From Germany Swimming!

Domains Just when we learn it one way, they add something else!! Now we have a level higher than the Kingdom. We call it the Domain.

7 Taxonomic levels Can be compared to our address system Kingdom (broadest)----- Country Phylum State Class County Order City Family Neighborhood Genus Street Species (most specific)- House #

Leopard

What is a Species? Group of similar organisms that reproduce NATURALLY and create FERTILE offspring

Binomial Nomenclature Scientific Names Scientists avoid using common names to prevent confusion because they vary from region to region. Blue Jay EasternBlue JayWestern Blue Jay Cyanocitta cristata Cyanocitta stellari

Binomial Nomenclature Scientific Names 2 part naming system that consists of genus and species. Rules for writing scientific names: Genus: first word - first letter capitalized Species: second word - lowercase Both are underlined or italicized EX: Homo sapiens : Human beings Sialia sialis: Eastern Bluebird

Modern Classification Problems with traditional system: focused only on morphology (appearance) Modern Criteria for Classification uses: *Morphology/Anatomy *Development *DNA Comparison- DNA sequences *Evolutionary descent

Evolutionary Classification Cladistics: the science of grouping organisms based on evolutionary descent, not just morphology. Cladogram: a diagram that shows evolutionary relationships among organisms. Derived character: characteristic that appears in recent parts of a lineage, but not in the older members. Used to build cladograms.

Cladogram

Dichotomous Key Classification tool which consists of a series of choices which lead the user to the correct identification of an organism.

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