TAXONOMY. The Science of Classifying Organisms. Chapter 18
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1 TAXONOMY The Science of Classifying Organisms Chapter 18
2 Why do we need to classify? Imagine a store..how do you know where to find the milk or the cereal? Are they in the same aisle? How is the store organized? Are all stores similar? Imagine your computer or mp3 player..are all of your songs and files in a single folder or do you have them grouped in some way?
3 When you have a lot of information, it is best to organize and group items so that you can find them easier or easily see their relationship to other items.this is why we CLASSIFY Even websites must organize their products
4 Scientists also need a way to *NAME* organisms The common names used by people can sometimes be misleading or confusing In order to communicate effectively, biologists need a CONSISTENT naming protocol. *Check out these slides of confusing names..
5 Photo Credits Sea Lion: Bill Lim Ant Lion: Amphioxus Lion: law_keven Sea Lion? Antlion? Lion?
6 Which one of these is NOT actually a bear? Photo Credits Panda: Chi King Koala: Belgianchocolate Black Bear: SparkyLeigh
7 What kind of organism is it? (invertebrate, mammal, insect, fish, reptile..) 1. Sea Monkey 2. Firefly 3. Ringworm 4. Jellyfish 5. Spider monkey 6. Crayfish 7. Sea Horse Photo Credit: Audringje; flickr
8 Consider this.. Are all Grey Wolves gray? Are all Black Bears black? Which is more venomous a water moccasin or a cottonmouth? Grey wolves can be white, black and any shade of gray. Black bears can also be brown or gray A cottonmouth and a water moccasin are the same animal the names vary by region.
9 Naming and Organizing are part of the same process The system was developed by Carolus Linnaeus who used Greek and Latin names for organisms He also created a system where we place all organisms into a few *large* groups - KINGDOMS - and then those groups are further divided into smaller groups
10 Grouping Kingdom Phylum Class Order Family Genus Species Each group gets smaller and more specific just think of the way you file things on your computer into folders and subfolders
11 To help you remember the list KING PHILIP CAME OVER FOR GREAT SOUP Kingdom, Phylum, Class, Order, Family, Genus, Species
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13 More on Naming.. The system of naming is called BINOMIAL NOMENCLATURE - which means it is a 2- name system. Scientific names must either be underlined or italicized The genus is always capitalized, the species is lowercase Can be abbreviated. Ex. F. leo and F. tigris
14 Humans Kingdom Phylum Class Order Family Genus Species Animalia Chordata Mammalia Primate Hominidae Homo sapiens The scientific name is always the genus + species Humans = Photo by atomicshark
15 Lion Tiger Pintail Duck Kingdom Animalia Animalia Animalia Phylum Chordata Chordata Chordata Class Mammalia Mammalia Aves Order Carnivora Carnivora Anseriformes Family Felidae Felidae Anatidae Genus Panthera Panthera Anas Species Leo Tigris Acouta What are the scientific names of each of these organisms?
16 Check for Understanding 1. Which two groups are used for an organism's scientific name? 2. The system we use for naming is called nomenclature. 3. Which of the following pairs is MOST closely related? Acer rubrum & Acer saccharum Acer rubrum & Chenopodium rubrum
17 The Kingdoms There are currently 6 kingdoms all organisms can be placed into one of those 6. Classification into a kingdom is based on certain criteria o Number of cells unicellular / multicellular o How it obtains energy autotroph / heterotroph o Type of cell prokaryote / eukaryote o Cell Wall makeup no / yes (chitin, cellulose, peptidoglycan)
18 Kingdom Animalia Photo by Tambako the Jaguar Multicellular Heterotrophic (must consume food) Eukaryotic (cells have a nucleus) Examples: birds, insects, worms, mammals, reptiles, humans Photo by Eduardo Amorim
19 Kingdom Plantae Multicellular Autotrophic (can make own food; photosynthesis) Eukaryotic (cells have nucleus) Cellulose Cell Wall Photo by hira3
20 Kingdom Fungae Multicellular (most) Heterotrophic (mainly decomposers) Eukaryotic Chitin Cell wall Photos by nutmeg66
21 Kingdom Protista Most are unicellular Can be hetertrophic or autotrophic Eukaryotes (all have nucleus) Examples: Ameba, paramecium, euglena, algae Most live in water Photo of Ameba by PROYECTO AGUA **/** WATER PROJECT
22 Kingdom Eubacteria & Kingdom Archaebacteria Unicellular Can be autotrophic or heterotrophic Prokaryotes (do not have a nucleus) Eubacteria = common bacteria; peptidoglycan cell wall (E. coli, Salmonella) Archaebacteria = ancient bacteria, exist in extreme environments; cell wall different molecules
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24 Three Domain System Recently, scientists have added a group above Kingdom. Three groups, called DOMAINS, contain each of the six kingdoms. Domain Eukarya - includes organisms composed of eukaryotic cells (plants, animals, fungi, protists) Domain Bacteria - includes all prokaryotic cells, Kingdom Eubacteria Domain Archaea - includes only "ancient" bacteria, Archaebacteria
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26 Practice Questions Knowledge of which of these is most important in classifying this new organism into a kingdom? F The color of light absorbed by the organism G The type of radiation emitted H The use of photosynthesis J The color of the organism Characteristics of a Newly Discovered Organism Absorbs blue light Emits infrared radiation Contains RNA in nucleus Appears as a red organism in full daylight Can obtain nutrition through photosynthesis
27 Practice Questions Knowledge of which of these is most important in classifying this new organism into a kingdom? F The color of light absorbed by the organism G The type of radiation emitted H The use of photosynthesis J The color of the organism Characteristics of a Newly Discovered Organism Absorbs blue light Emits infrared radiation Contains RNA in nucleus Appears as a red organism in full daylight Can obtain nutrition through photosynthesis Key phrase
28 Practice Questions Knowledge of which of these is most important in classifying this new organism into a kingdom? F The color of light absorbed by the organism G The type of radiation emitted H The use of photosynthesis J The color of the organism Strategy: Think about ways biologist classify info: How they get energy, cell structure, etc. Characteristics of a Newly Discovered Organism Absorbs blue light Emits infrared radiation Contains RNA in nucleus Appears as a red organism in full daylight Can obtain nutrition through photosynthesis Key phrase
29 Practice Questions Knowledge of which of these is most important in classifying this new organism into a kingdom? F The color of light absorbed by the organism G The type of radiation emitted H The use of photosynthesis J The color of the organism Characteristics of a Newly Discovered Organism Absorbs blue light Emits infrared radiation Contains RNA in nucleus Appears as a red organism in full daylight Can obtain nutrition through photosynthesis Taxonomy uses characteristics of the organism, such as how the organism obtains energy, in classifying.
30 Taxonomy Clades and Keys
31 Identifying Unknown Organisms When biologists do field studies, they often encounter new specimens that they would need to identify FIELD GUIDES often contain pictures for referencing organisms
32 Dichotomous Keys A step-by-step guide to help identify an organism Follows a series of choices that lead you to the organism s name What am I?? Photo Credit: Sam? (Flickr)
33 1. Has green colored body...go to 2 Has purple colored body... go to 4 2. Has 4 legs...go to 3 Has 8 legs... Deerus octagis 3. Has a tail... Deerus pestis Does not have a tail... Deerus magnus 4. Has a pointy hump... Deerus humpis Does not have a pointy hump...go to 5 5. Has ears...deerus purplinis Does not have ears...deerus deafus
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Cladograms. A diagram that shows evolutionary relationships
Cladograms A diagram that shows evolutionary relationships TAXONOMY The Science of Classifying Organisms Why do we need to classify? Imagine a store..how do you know where to find the milk or the cereal?
TAXONOMY. The Science of Classifying Organisms
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NAME pg. 1 Classification Domain Kingdom Phylum Class Order Family Genus species Eukarya Animalia Chordata Mammalia Primate Hominidae Homo sapiens Mnemonic: DUMB KING PHILIP CAME OVER FOR GOOD SOUP Domain
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