Classification of Life

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Presentation transcript:

Classification of Life First classification system placed all life into 2 groups: Plants or Animals. Next system developed used 7 subdivisions: Kingdom Phylum Class Order Family Genus Species Current system uses these 7 plus a larger group: DOMAIN

Classification of the Grizzly Bear DOMAIN: Eurkaya (eukaryotic cells) KINGDOM:Animalia PHYLUM: Chordata CLASS: Mammalia ORDER: Carnivora FAMILY: Ursidae GENUS: Ursus SPECIES: Ursus arctos

Each subdivision becomes more specific. Ex. Domain is most diverse Species is least diverse Each subdivision is called a taxon. Binomial Nomenclature Using the last 2 taxon (genus & species) as the scientific name. Ex. Common name- tiger Scientific name- Panthera tigris Common name- human Scientific name- Homo sapiens

How do you classify? 1. Physical traits - grouping based on physical similarities 2. DNA similarities - grouping based on similar genes. 3. Evolutionary History - Ex. Cladogram - diagram that shows evolutionary relationships.

CLASSIFICATION BASED ON VISIBLE SIMILARITIES Traditional Classification Versus Cladogram Appendages Conical Shells Crustaceans Gastropod CLASSIFICATION BASED ON VISIBLE SIMILARITIES CLADOGRAM

Cladogram/Phylogenetic Tree

Current Method of Classifying DOMAINS: 1. Archae - prokaryotes that live in extreme environments Ex. hot springs and acid pools - includes Kingdom Archaebacteria

- most common type of prokaryote - includes the Kingdom Eubacteria Streptococcus - causes strep throat E. Coli - helps aid digestion

3. Eukarya - eukaryotic organisms (nucleus) - includes 4 Kingdoms: Protist Fungi Plant Animal

Cladogram of 3 Domains and 6 Kingdoms DOMAIN EUKARYA DOMAIN ARCHAEA Eubacteria Archaebacteria Protist Plant Fungi Animal DOMAIN BACTERIA

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