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Classification Keys: Identifying Unknown Organisms

Explore different types of classification keys and learn how to use them to identify unknown organisms. This presentation covers dichotomous keys, classification tables, flow charts, and branch diagrams.

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Classification Keys: Identifying Unknown Organisms

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  1. SPI 0807.5.1 Classification Keys Notes Science Tennessee SPI Objective: Use a simple classification key to identify an unknown organism. Essential Question(s) How do I use… 1) …a dichotomous key to identify an organism? 2) …a classification table to identify an organism? 3) …a flow chart to identify an organism? 4) …a branch diagram to identify an organism? Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher. Success Criteria I can… 1) …identify an organism with a dichotomous key. 2) …identify an organism with a classification table. 3) …identify an organism with a flow chart. 4) …identify an organism with a branch diagram. ing products. 3) I can contrast adaptive and assistive bioengineering products.

  2. SPI 0807.5.1 Classification Keys Science Notes Classification and Classification Keys • Before we investigate classification keys, it is helpful to first examine some general classification concepts. Starting with… Taxonomy • Taxonomy is the science of defining, naming, and classifying organisms. • Organisms are classified according to similar physical and genetic characteristics.

  3. Modern Taxonomy 8 Levels of Classification Categories go from broad to narrow 1) Domain 2) Kingdom 3) Phylum 4) Class 5) Order 6) Family 7) Genus Broad Narrow 8) Species

  4. 8-Level Classification System • Categories go from broad to narrow Broad 1) The Universe 2) Milky Way Galaxy 3) Solar System 4) Planet Earth 5) North America 6) United States of America 7) Tennessee 8) Smyrna Narrow Example: Location of Rock Springs Middle School

  5. Classification Levels Memory Trick 01 Did King Phillip Come Over From Great Spain? 1) Domain 2) Kingdom 3) Phylum 4) Class 5) Order 6) Family 7) Genus 8) Species

  6. Classification Levels Memory Trick 02 Donkey Kong Puts Children On Flying Giant Squirrels 1) Domain 2) Kingdom 3) Phylum 4) Class 5) Order 6) Family 7) Genus 8) Species

  7. Classification Criteria • In taxonomy organisms are classified according to similar physical and genetic characteristics. Example 01: At the Domain level -organisms are classified according to whether or not their cell(s) contains a nucleus. Prokaryotic Cell (no nucleus) Eukaryotic Cell (has a nucleus)

  8. Classification Criteria • In taxonomy organisms are classified according to similar physical and genetic characteristics. Example 02: At the Class level -organisms are grouped according to similar physical characteristics. Classes of Animals

  9. SPI 0807.5.1 Classification Keys Science Notes Binomial nomenclature Note: In Latin “bi” means two and “nomial” means name • Uses the last 2 classification levels (Genus and Species) to name an organism. Example:Human Beings Genus: __________ Species: __________ Homo Sapiens • Around 1735 Carolus Linnaeus created a two-part naming system called binomial nomenclature.

  10. SPI 0807.5.1 Classification Keys Science Notes 8-Level Classification System Example: Human Beings (Homo Sapiens) 1) Domain: Eukarya 2) Kingdom: Animalia 3) Phylum: Chordata 4) Class: Mammalia 5) Order: Primates 6) Family: Hominoidia 7) Genus: Homo Binomial Nomeclature 2 part naming system 1st part 2nd part 8) Species: Sapiens

  11. Example: Wolves Genus: __________ Species: __________ Canis lupus Example: Domesticated Dogs Genus: __________ Species: __________ Canis familaris Example: Domesticated Cats Genus: __________ Species: __________ Felis catus Example:Bottlenosed Dolphins Genus: __________ Species: __________ Tursiops truncatus

  12. Review Questions Classification: General Concepts 1) What is taxonomy? (slide 2) 2) What is binomial nomenclature? (slides 9 & 10) 3) What are the 8 levels of classification? (slide 3) 4) Which 2 levels are used for scientific names? (slide 9) 5) What is the scientific name for humans? (slides 9 & 10)

  13. Classification Keys • scientists use these keys to help them identify organisms Dichototmous Keys Includes paired descriptive statements to identify organisms 1st Statement 2nd Statement

  14. Classification Keys • scientists use these keys to help them identify organisms Classification Tables: -has columns and rows with information

  15. Classification Keys • scientists use these keys to help them identify organisms Flow Charts: -design is similar to a concept map, lines branch off from given traits

  16. Classification Keys • scientists use these keys to help them identify organisms SPI 0807.5.1 Classification Keys Notes Science Branch Diagram: -looks similar to a tree branch, listed traits apply to all those organisms that come after

  17. Review What kind of classification key is this? Flow Chart Classification Table Dichotomous Key Branch Diagram

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