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NOTES 6.4 The classification system continues to change Learning Intentions: Success Criteria: To understand how the Linnaean Taxonomy System works I can use the Linnaean Taxonomy system I can remember the 7 levels of classification To remember the 7 levels of classification Linnaean Taxonomy Dichotomous key The Linnaean Taxonomy Dichotomous key was first developed by Carl Linnaeaus 1707-1778 In the Linnaean Key all living things are grouped into a large grouped called a KINGDOM first. Then they are divided into smaller groups called PHYLA. Each Phylum has seven CLASSES There are 7 different levels to get to the final name of each organism 1. 2. 3. 4. 5. 6. 7. Kingdom Phylum Class Order Family Genus Species For example the domestic Kingdom Animalia Phylum Chordata Class Mammalia Order Carnivora Family Felidae Genus Felis Species catus cat Scientific Name: ‘Felis catus’ Organisms are named form the last 2 groupings on the Linnaean Dichotomous key Organisms have double names: The domestic dog : Canis Familiaris Genus Species Linnaeus double naming system Binomial naming system 1st name: Genus – starts with a capital letter 2nd name Species- No capital letter The double naming system is always written using italics (sloping letters) A species is a group of organisms that look the similar to each other and can produce fertile offspring Eg domestic cats belong to the same species because they can breed together and have kittens which are fertile( in other words they can also breed. A horse and a donkey can breed to get a mule however their offspring are infertile and therefore cannot breed. Changing to science and naming The development of the microscope let to the discovery of a single celled organism called Bacteria This led to the number of kingdoms increasing form 3 to 5 Plants Plantae Animals Animalia Minerals Fungi Protists monera There is also a 6th kingdom ARCHEA Single celled organisims that could live in extreme conditions eg very salty water or hot waters The genetic materials DNA of these organisms was different from that of other bacteria Ways to remember the 7 classification system King Phillip Can Order Fine Good Soup King Philip Crawled Over Four Gooey Snails K Kingdom Anamalia P Phylum Chordata/vertebrata C Class Mammalia O Order Primates Humans scientific name ‘Homo sapiens’ F Family Hominidae G Genus Homo S Species sapiens