copyright cmassengale Unit 12 Classification & Taxonomy Ch. 17 Test 3-18/19
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1 copyright cmassengale 1 Unit 12 Classification & Taxonomy Ch. 17 Test 3-18/19
2 copyright cmassengale 2 BIOLOGICAL CLASSIFICATION(pp ) I. Early Systems of CLASSIFICATION Classification is the grouping of items (living or non-living) based on similarities.
3 copyright cmassengale 3 Benefits of Classifying Accurately & uniformly names organisms Prevents misnomers such as starfish & jellyfish that aren't really fish Uses same language (Latin or some Greek) for all names Sea horse??
4 copyright cmassengale 4 Aristotle s system- Greek philosopher ( b.c.) More than two thousand years ago developed 1 st widely accepted system Based on his view that species are distinct, separate & unchanging,
5 copyright cmassengale 5 animals Classified organisms as either or. plants Animals classified according to the presence or absence of. red blood Further classified by habitats & morphology. Plants classified by average size & structure as trees, shrubs, herbs evolutionary Did not account for relationships
6 copyright cmassengale 6 Linnaeus s System- Swedish naturalist ( ) Based on observational studies of the morphology & the behavior of organisms.. Example: Birds organized into 3 major groupsbirds of prey, wading birds & perching birds
7 copyright cmassengale 7 First formal system of taxonomic organization Taxonomy a. - discipline of biology concerned with & identifying, naming classifying species based on. natural relationships Part of larger branch of systematics Biology called - study of biological diversity with an emphasis on evolutionary history
8 copyright cmassengale 8 Binomial nomenclature Developed by Linnaeus- gives each species a scientific name that has two parts. genus First part is the name Second part is the - name that identifies the. species Latin is the basis used because Latin is an specific unchanging language
9 Binomial Nomenclature Which TWO are more closely related? copyright cmassengale 9
10 copyright cmassengale 10 How to write scientific name Genus name is always Species name is always typed If the name it should be italicized If writing the name under the both parts should be underlined EX: Homo sapiens capitalized lowercase
11 copyright cmassengale 11 Modern classification systems Since Darwin s theory of evolution scientist began classify also on the basis of inferred evolutionary relationships Today still rooted in the Linnaeus tradition, modified to reflect new knowledge about evolutionary ancestry. (DNA)
12 copyright cmassengale 12 II.Taxonomic Categories- (p ) A. Organisms are subdivided based on more specific criteria B. Taxonomic categories are part of a nested-hierarchical system from broadest to most specific C. Taxon (plural, taxa)- named group of organisms 1. Categories of Classification
13 copyright cmassengale A. Categories of Classification a. Domain- Broadest of all categories b. Kingdom groups of closely related phyla c. Phylum groups of closely related d. Class groups of closely related e. Order - groups of closely related classes orders families
14 copyright cmassengale 14 A. Categories of Classification f. Family - groups of closely related genera species g. Genus - groups of closely related Smallest specific h. Species and most classification group; organisms that share Closely related and can interbreed characteristics
15 copyright cmassengale 15 *Memory Helper * King Phillip Came Over For Good Soup or Kids Play Chess On Fat Guy s Stomach
16 How Can You Remember the 6 Taxon levels? King Philip Came Over for Good Soup Kids Play Chess Over favorite Gooey Snacks Katie Please Come Over for Ginger Snaps Can you come up with your own pneumonic? K? P? C? O? f? G? S?
17 copyright cmassengale 17 Dumb King Phillip Came Over For Good Soup!
18 copyright cmassengale 18 Species of Organisms There are 13 billion known species of organisms This is only.1% of all organisms that ever lived!!!!! New organisms are still being found and identified
19 copyright cmassengale 19 What is Classification? Taxonomists are scientists that identify & name organisms
20 copyright cmassengale 20 Confusion in Using Different Languages for Names
21 copyright cmassengale 21 Latin Names are Understood by all Taxonomists
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24 copyright cmassengale 24 III. Determining Species- (p ) It s not always easy to define a species. As knowledge increases, definitions change. The concept of a species today is much different than it was 100 years ago. There are three different ways to look at the species concept: The term phylogeny is used in one conceptphylogeny is the evolutionary history of a species
25 copyright cmassengale 25 IV. Phylogenetic Reconstruction (p ) A.Cladistics- method that classifies organisms according to the order that they diverged from a common ancestor. 1. Ancestral traits (character)- found within the entire line of descent of a group of organisms. 2. Derived traits (character)- are present in members of one group of the line but not in the common ancestor. a. EX. Looking at birds & mammal the ancestral trait would be the backbone b. Derived trait for mammals would their fur and for birds their feathers.
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27 copyright cmassengale 27 B. Cladograms- Branching diagram that represents the proposed phylogeny or evolutionary history of a species or group. It s a model similar to a pedigree- branches show direct ancestry; cladogram s branches indicate phylogeny.
28 copyright cmassengale 28 Construction of a cladogram Clades- one branch of the cladogram Outgroup- is the species or group of species that has more ancestral traits with respect to the other organisms being compared. Nodes- where the branches originate represent a common ancestor.
29 copyright cmassengale 29 Common ancestor is generally not a known organism, species, or fossil, its hypothesized based on the traits of its descendants. Constructed by sequencing the order in which derived characters evolved with respect to the outgroup. Closeness of clades indicate the number of characters shared
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32 copyright cmassengale 32 V. Domains & Kingdoms (p ) A. Domain Added in 1990; based on research showing that the ribosomal RNA nucleotide sequences of organisms fell into 3 groups. Eubacteria 1. Domain Bacteria Includes the 2. Archaea Includes all remaining prokaryotes or the Archeabacteria 3. Domain Eukarya Includes all eukaryotic kingdoms - & Animalia Protista, Fungi, Plantae,
33 copyright cmassengale 33 A. Kingdom Archaebacteria prokaryotic 1. Cell Type - cell wall without peptidoglycan; cell membrane 2. Cell Structure -, ribosomes, DNA, cytosol present
34 copyright cmassengale 34 A. Kingdom Archaebacteria 3. Body Form - all unicellular (single-celled) autotrophic or heterotrophic 4. Nutrition - 5. Other Characteristics Considered to be the most ancient of organisms; live in very harsh conditions like extreme temperatures, high salt concentration, etc. Another group of Archaebacteria live in the digestive system of animals and produce gas. methane
35 copyright cmassengale 35 A. Kingdom Archaebacteria
36 copyright cmassengale 36 B. Kingdom Eubacteria prokaryotic 1. Cell Type - cell walls with 2. Cell Structure - peptidoglycan, cell membrane, ribosomes, DNA, cytosol present all unicellular 3. Body Form -
37 copyright cmassengale 37 B. Kingdom Eubacteria heterotrophic 4. Nutrition Mostly ; some are autotrophic common 5. Other Characteristics Most bacteria. They are ubiquitous which means they are. everywhere!! Very important. decomposers Some are pathogenic (disease-producing), but most are harmless or even helpful E. coli, Strep, Staph 6. Examples -
38 copyright cmassengale 38 B. KINGDOM EUBACTERIA
39 copyright cmassengale 39 C. Kingdom Protista eukaryotic 1. Cell Type - chloroplasts cell wall motile cilia multicellular flagella unicellular 2. Cell Structure May have ; may have ; May be and have or. 3. Body Form Mostly ; may be
40 copyright cmassengale 40 C. Kingdom Protista 4. Nutrition - 5. Other Characteristics Nicknamed catch-all kingdom or life! autotrophic or heterotrophic. Contains that don t fit into other kingdoms. Protists are subgrouped according to which kingdom they re most like; for example, -like, -like, or -like. 6. Examples -, junk drawer of eukaryotes eukaryotic animal plant fungus amoeba, paramecium, molds algae
41 copyright cmassengale 41 C. KINGDOM PROTISTA
42 copyright cmassengale Cell Type - D. Kingdom Fungi eukaryotic cell walls 2. Cell Structure Have made of. Fungi do not have. chitin multicellular chloroplasts! 3. Body Form Mostly ; may be. unicellular Single-celled fungi are known as. yeasts
43 copyright cmassengale 43 D. Kingdom Fungi heterotrophic 4. Nutrition All! Obtain nutrients through a process called absorption, meaning food is digested extracellularly by secretion of, enzymes then absorbed by fungi. (outside of body) decomposers 5. Other Characteristics Principle. Also important in brewing and. baking All. non-motile yeasts, mushrooms, molds 6. Examples -
44 copyright cmassengale 44 D. KINGDOM FUNGI
45 copyright cmassengale 45 E. Kingdom Plantae eukaryotic 1. Cell Type - 2. Cell Structure Have cell walls made of ; cellulose chloroplasts present. 3. Body Form All multicellular autotrophic 4. Nutrition All
46 copyright cmassengale 46 E. Kingdom Plantae 5. Other Characteristics Most contain organs and. organ systems All non-motile with specialized structures. reproductive Trees, mosses, ferns, etc 6. Examples -
47 copyright cmassengale 47 E. KINGDOM PLANTAE
48 copyright cmassengale 48 F. Kingdom Animalia eukaryotic 1. Cell Type - 2. Cell Structure Never have. multicellular 3. Body Form All heterotrophic 4. Nutrition All cell walls!
49 copyright cmassengale 49 F. Kingdom Animalia 5. Other Characteristics Most of all kingdoms. Most organisms contain organ systems and. All members are movement capable of sometime during complex organs lifetime. Most animals are do not have invertebrates meaning they a backbone. Chordata All vertebrates belong to Phylum. sponges, coral, insects, ect 6. Examples -
50 copyright cmassengale 50 F. KINGDOM ANIMALIA
51 III. TAXONOMY copyright cmassengale 51
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54 copyright cmassengale 54 Basis for Modern Taxonomy Homologous structures (same structure, different function) Similar embryo development Molecular Similarity in DNA, RNA, or amino acid sequence of Proteins
55 copyright cmassengale 55 Dichotomous Keying Used to identify organisms Characteristics given in pairs Read both characteristics and either go to another set of characteristics OR identify the organism
56 copyright cmassengale 56 Example of Dichotomous Key 1a Tentacles present Go to 2 1b Tentacles absent Go to 3 2a Eight Tentacles Octopus 2b More than 8 tentacles 3 3a Tentacles hang down go to 4 3b Tentacles upright Sea Anemone 4a Balloon-shaped body Jellyfish 4b Body NOT balloon-shaped - 5
57 III Plant Classification Plants are divided into two basic groups based on whether they contain vascular tissue: A.Bryophytes (pp ) Bryophytes, or mosses, are the only group of plants that lack vascular tissue. This limits both the size and location of this group of plants. Mosses are small and typically live in moist areas. In addition, a moist climate is required because mosses have swimming sperm. The sperm must swim to the egg cell in order for fertilization to take place.
58 Bryophyte-Moss
59 B. Tracheophytes (pp ) Tracheophytes are vascular plant which allows them to grow larger. The tracheophytes are further subdivided based on the presence or absence of pollen, seeds, and fruit: Pterophytes-No pollen, no seeds, no fruits Pterophytes are commonly called ferns. Although ferns contain vascular tissue, they are still found predominantly in moist climates because the sperm must swim to the egg cell.
60 C. Tracheophytes with Seeds All other tracheophytes produce seeds. Seeds provide a tremendous reproductive advantage. A seed consists of an embryo surrounded by a tough protective coat. Advantages of Seeds a. Protection b. Nourishment-Starch is stored in the seed for developing embryo c. Dispersal-Easily spread by wind, animals, water; reduces competition for nutrients d. Dormancy-Seeds remain dormant or inactive until conditions are favorable
61 Types of Seed Plants 2. Gymnosperms-Have pollen and seeds, no fruit. The word gymnosperm means naked seed because the seed is not protected by a fruit. A unique characteristic of gymnosperms is the presence of cones. The largest and most common phyla is confiers which includes pines, spruce, cedar. Confiers have characteristic leaves called needles, which are modified to prevent water loss and minimize ice build-up. In addition, gymnosperms (and angiosperms) have flying sperm or pollen. So they are no longer tied to water for reproduction. 3. Angiosperms-Have pollen, seeds, and fruit
62 IV. Angiosperms-Tracheophytes with Seeds & Fruit (pp ) Angiosperms are the most complex and adaptable of all plant groups. They are also the most successful due to two important modifications: A. Fruit- A fruit is a mature ovary that contains one or more seeds. It provides the embryo with greater protection and nutrients than found in gymnosperm seeds. The fruit also increases seed dispersal because fruits are eaten by animals, seeds pass through the digestive tract and are eliminated. Some fruits are not intended to be edible.
63 B. Flower The flower is the reproductive system of the angiosperm. It enhances pollination, which occurs as a first step to fertilization. 1.The male reproductive organ is the stamen, which consists of the anther and filament. Pollen, is produced by the anther and contains the sperm cells.
64 2. The female reproductive organ is the pistil, which consists of the sticky top called the stigma, the neck called the style, and the base called the ovary. The ovary contains the female gametes ovules or eggs. During pollination, pollen is transferred from the anther to the stigma. When a pollen grain lands on a stigma, it sends out a pollen tube that grows through the style to the ovary. Once the sperm reached the egg cell, fertilization take place.
65 3. The petals are usually colorful to attract pollinators. 4. The sepals are protective green modified leaves at the base of a flower. They protect the bud before the flower blooms.
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67 C. Types of Angiosperms 1. Angiosperms are further classified into two groups based on characteristics. Monocots include plants such as grasses, corn, lilies. Monocot seeds have one cotyledon (seed leaf). These are seeds that cannot be split in half, like a piece of corn. Dicots are more abundant and include plants such as roses, oak trees, etc. Dicots have two cotyledons. These seeds can be split in half like peanuts and beans
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