Classification Cladistics & The Three Domains of Life. Biology Mrs. Flannery
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1 Classification Cladistics & The Three Domains of Life Biology Mrs. Flannery
2 Finding Order in Diversity Earth is over 4.5 billion years old. Life on Earth appeared approximately 3.5 billion years ago and has been changing due to natural selection as well as other processes and has led to an incredible amount of diveristy. 1.5 million species have been named so far!!! million more species have yet to be discovered!!!!
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4 ???????????????? What is the scientific name for the human species??? What do you think the common name is for Felis catus? How about Canis familiaris? In each case, what does the first of the two names refer to? What do the two names together refer to? Which group is more inclusive?
5 What is Classification? Classification is the arrangement of organisms into orderly groups based on their similar characteristics. The science of classification which involves identifying, classifying and naming is also known as taxonomy. taxis = arrangement or order nomy = law
6 Why Do We Need to Classify Organisms? Coryphaena hippurus Tursiops truncatus
7 Why Do We Need to Classify Organisms? Cougar Mountain lion Puma Panther Puma concolor
8 Panthera onca
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11 Carolus Linnaeus 18th century Swedish botanist Known as the Father of Taxonomy Classified organisms by their structure, size, shape and color. Developed the binomial nomenclature system. Every organism gets a two-word name (Genus & species)
12 Present System of Classification uses language of Latin system uses binomial nomenclature (bi = two, nomen = name) creatures are known by their genus and species name based on structure, DNA, evolutionary descent human gorilla rainbow trout Homo sapien Gorilla gorilla Oncorhynchus mykiss genus name and species name italics if typed, underline if handwritten genus name capitalized, species name lower case
13 Linnaeus s System of Classification Hierarchical system (consists of levels) Each level is called a taxon. Domain Kingdom Phylum Class Order Family Genus Species
14 Kingdom largest and most inclusive Phylum group of closely related classes Class group of similar orders Order group of similar families Family a group of genera that share many characteristics Genus a group of closely related species Species a group of similar organisms that can breed and produce fertile offspring.
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16 Which two animals are more closely related? Ursus arctos Ursus maritimus Ailuropoda melanoleuca
17 Kingdom: Animalia Animalia Animalia Phylum: Chordata Chordata Chordata Class: Mammalia Mammalia Mammalia Order: Carnivora Carnivora Carnivora Family: Ursidae Ursidae Ursidae Genus: Ursus Ursus Ailuropoda Species: U. maritimus U. arctos A. melanoleuca
18 Kingdom: Animalia Animalia Animalia Phylum: Chordata Chordata Chordata Class: Mammalia Mammalia Mammalia Order: Carnivora Carnivora Carnivora Family: Genus: Species: Felidae Panthera P. leo Felidae Felis F. silvestris Felidae Felis F. catus
19 Modern Evolutionary Classification In Linnaeus s time organisms where classified based solely on their observable adult traits. This posed many problems because animals that looked similar were classified together even though they were not closely related.
20 Family: Ailuridae Family: Ursidae
21 Evolutionary Classification- Systematics Darwin s ideas about descent with modification gave rise to the study of phylogeny. Phylogeny is the study of evolutionary relationships among organisms. Evolutionary classification is the strategy of grouping organisms together based on their evolutionary history.
22 Evolutionary Classification- Systematics Homologous structures are one of the best sources of information for phylogenetic relationships. The greater the number of homologous structures between two species, the more closely related the two species are. DNA comparisons
23 Classification Using Cladograms Derived characters are characteristics that appear in recent parts of a lineage or family tree but not in its older members. These characteristics are used to derive cladograms, which are diagrams that show the evolutionary relationship amoung a group of organisms.
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25 Understanding Phylogenies When a lineage splits (speciation), it is represented as branching on a phylogeny. When a speciation event occurs, a single ancestral lineage gives rise to two or more daughter lineages. Phylogenies trace patterns of shared ancestry between lineages. Each lineage has a part of its history that is unique to it alone and parts that are shared with other lineages. Similarly, each lineage has ancestors that are unique to that lineage and ancestors that are shared with other lineages common ancestors.
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27 Similarities in DNA and RNA All organisms use DNA and RNA to pass on information to their offspring and to control growth and development Genes (DNA) of many organisms show important similarities at the molecular level. These similarities can be used to help determine classification and evolutionary relationships. For example..myosin is a protein found in our muscles. We have a gene that codes for myosin, but so does yeast!!! Which means that we must share a common ancestor!!
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30 Kingdoms and Domains In Linnaeus's time the only known differences among living things were the fundamental traits that separated animals from plants. Animals were mobile and ate food for energy Aristotle's Classification Plants were green, used photosynthesis to convert the sun s rays into energy.
31 Tree of Life Evolves As more information about the natural world became known biologists realized they needed more than just two kingdoms to classify all of the organisms. First Introduced Changing Number of Kingdoms Name of Kingdoms 1700s Plantae Animalia Late 1800s Protista Plantae Animalia 1950s Monera Protista Fungi Plantae Animalia 1990s Eubacteria Archaebacteria Protista Fungi Plantae Animalia We use the six kingdom system of classification today!!!
32 Three Domain System Scientist now group modern organisms according to how long they nave been evolving independently. Domain is a more inclusive category larger than a kingdom. There are 3 Domains Bacteria: Eubacteria Archaea: Archaebacteria Eukarya: Protista, Fungi, Plantae, Animalia
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34 Domain: Bacteria Kingdom: Eubacteria Prokaryotic Unicellular Thick rigid cell walls surrounded by a cell membrane Peptidoglycan in cell wall Autotroph or heterotroph
35 Domain: Archaea Kingdom: Archaebacteria Prokaryotic (some research suggests they are closer to eukaryotes based on gene comparison) Cell wall without peptidoglycan Autotroph or heterotroph Can survive without oxygen Extremophiles: halophiles and thermophiles. Methanogens produce methane gas (CH 4 )
36 Sulfolobus is an extremophile that is found in hot springs and thrives in acidic and sulphur-rich environments. Methanosarcina rumen is anaerobic, and is found in places with little or no oxygen. It is a methane- producing organism that digests decaying organic matter. It is found in the rumen of a group of animals called ruminants such as cattle and sheep. Staphylothermus marinus is an extremophile found in deep ocean hydrothermal vents, thriving on volcanic sulphur and surviving in water temperatures of up to 98 C.
37 Halococcus salifodinae is found in water with high concentrations of salt. These high salt concentrations would be deadly to most other forms of life, and so H. salifodinae is also known as an extremophile. Methanococcoides burtonii is an extremophile and was discovered in 1992 in Ace Lake, Antarctica, and can survive in temperatures as low as -2.5 C.
38 Domain: Eukarya Kingdom: Protista Eukaryotic organisms that cannot be classified as animals, plants or fungi Greatest variety of all kingdoms! Unicellular for the most part, some are multicellular Some are photosynthetic and some heterotrophic
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40 Domain: Eukarya Kingdom: Fungi Heterotrophs Most multicellular, yeasts are unicellular
41 Domain: Eukarya Kingdom: Plantae Multicelluar Photosynthetic autotrophs Non-motile Cell wall contains cellulose
42 Multicellular Heterotrophic No cell walls Domain: Eukarya Kingdom: Animalia
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