Presentation on theme: "Classification: Chapter 17 Taxonomy 6 Kingdoms Dissection notes References: Holt Biology & sources as noted by page."— Presentation transcript:
Classification: Chapter 17 Taxonomy 6 Kingdoms Dissection notes References: Holt Biology & sources as noted by page.
Taxonomy Taxonomy is the science of describing, naming, and classifying organisms. Taxonomy is the science of describing, naming, and classifying organisms. The branch of biology that names & groups organisms -according to their characteristics & evolutionary history. A Universal System was designed to Eliminate the use of Common Names and Confusion in the Scientific World.
Use of Common Names COMMON NAMES, such as “robin” or “fir tree”, for organisms created some problems common names varied from one locale to next & did not describe species accurately. Use of long Latin names Used by scientists before 1700’s,- did not show relationships between species & were inconvenient, hard to understand.
Describe a problem with each of these common names : -Starfish -Seahorse -Jelly fish -Peanut -Catfish -Tiger shark How are their names misleading? Discuss problems when 1 organism has 2 common names: Example- firefly & lightening bug
Carl Linnaeus (1707-1778) “Father of Modern Taxonomy” morphology He used morphology (which is the organism’s structure & form) Grouped organisms into hierarchical categories
Carl Linnaeus Formed “Taxa” (groups of organisms) (Used Latin for the Names because it was the language of educated people) Morphology -the STRUCTURAL SIMILARITIES BETWEEN ORGANISMS Series of hierarchical categories used to show relationships He had 2 KINGDOMS: PLANTAE & ANIMALIA.
B. Modern classification system is based on morphological similarities. Hierarchy of eight groups (Taxa) – Domains – Domains - include all six kingdoms – Kingdom – Kingdom – a taxon of similar phyla or divisions – Phylum – Phylum – (phyla-plural)- taxon of similar classes – Class – Class – taxon of similar orders – Order – Order – taxon of similar families – Family – Family – group of similar genera – Genus – Genus – group of similar species – species – species – most exclusive, specific group. Members of this grouping can mate, produce viable offspring – (varieties) – same species but with slight differences – (subspecies) – same species, different location
8 Modern Levels of Classification (From the most general to the most specific) Domain Kingdom Phylum Class Order Family Genus Species Species- is the smallest, most specific group- contains only 1 kind of organism. You need toknowthese!
Pneumonic Devices pick one to help you remember the taxa Keep Penguins Cool Or Find Good Shelter or K ennywood P ark C an O pen F or G ood S ummers. or K ing P hillip C omes O ver F or G ood S paghetti
Two Name Naming Binomial Nomenclature means Two Name Naming Uses the last 2 categories (the most specific) to name things. uses the Genus & Species for the 2 parts of the name Always Capitalize the Genus but Not the Species Identifier. Both are either underlined or italicized.
Using Binomial Nomenclature Acer rubrum Acer rubrum - RED MAPLE TREE Acer is the Latin name for Maple (genus) rubrum is the Latin word for Red(species) Can be Abreviated: A.rubrum. Homo sapiens - Homo sapiens - HUMANS Homo -large brain & upright posture. sapiens for our intelligence & ability to speak. Abbreviated H. sapiens
Additional Categories Zoologists Zoologists – use term “SUBSPECIES” for variations that may occur in species from different geographical locations- ie, timber wolf and the northern timber wolf- ex Canis Lupus ssp occidentalis Botanists Botanists – May use the term “division” instead of phylum – sometimes split species into Subsets known as VARIETIES. Example: peaches & nectarines are varieties of Prunus persica var.
Microbiologists Microbiologists - Bacteria are also broken into subsets called STRAINS. Example: Escherichia Coli – some strains are harmless, even helpful;- live in our intestines, but strain E. coli 157 is responsible for food poisoning deaths. According to the CDC there are an estimated 73,000 cases of E. Coli infection every year in the United States. The typical symptoms are bloody diarrhea and (if severe) kidney failure. These symptoms most commonly appear when a person has eaten undercooked or contaminated ground beef. Additional Categories
Phylogeny organizes the diversity of living organisms in the context of evolution. are based on several types of evidence: 1.Fossil Record 2.Morphology 3.Embryology 4.Chromosomes & Macromolecules
Phylogenetic Trees A family tree that shows evolutionary relationships thought to exist among organisms. Is a hypothesis about the relationships. Is subject to change - as more evidence is learned.
Which organisms are mostly closely related? Which ones are most distantly related?
Taxonomic Groups 3 domains, 6 kingdoms 1. Domain Archaea Kingdom Archaebacteria – aligns with Kingdom Archaebacteria, are single- celled prokaryotic cells that have distinctive cell walls & are “ancient bacteria” 2. Domain Bacteria Kingdom Eubacteria, – aligns with Kingdom Eubacteria, are single-celled prokaryotic cells that are “true bacteria”. 3. Domain Eukarya Protista, Fungi, Plantae, & Animalia – Domain Eukarya includes the kingdoms Protista, Fungi, Plantae, & Animalia. – All members of this domain have eukaryotic cells.
SIX KINGDOMS GROUP ORGANISMS TOGETHER THAT HAVE SIMILARITIES SUCH AS MAJOR CELLULAR STRUCTURE, METHODS OF OBTAINING NUTRIENTS, AND METABOLISM.
Domain: Archaea, kingdom Archaea vs. Domain: Bacteria, Kingdom Eubacteria Organisms in the Kingdoms Eubacteria & Archaea are very different from each other, both genetically & biochemically! Archaea have been found in temperatures above the boiling point and in cold that would freeze your blood. Eubacteria are the “regular” bacteria.
“archae”- from the Greek for "ANCIENT".Scientists think these are similar to Earth’s First Organisms HARSH ENVIRONMENTS “ Extremophiles” – Many types of Archaeans live in HARSH ENVIRONMENTS Some types are Methanogens Methanogens Themoacidophiles Themoacidophiles Extreme Halophiles Extreme Halophiles Domain: Archaea, Kingdom Archaea 1. Archaea
Live in ANAEROBIC Environments, Produce Methane Gas, a byproduct of metabolism in conditions of very low oxygen Includes Chemosynthetic Bacteria. Lives in the Intestines of Mammals. Methanobrevibacter smithii is the prominent methanogen in the human gut, where it helps digest polysaccharides (sugars). Methanogens http://www.nature.com/nrgastro/journal/v8/n10/full/nrgastro.2011.159.html
Thermoacidophiles Thermoacidophiles - living in Sulfurous Hot Springs & Volcanic Vents They “ love”“acid” & “heat”
Extreme Halophiles Live in Very Salty Places (like the great Salt lake & the Dead Sea) (Halite is the mineral name for NaCl)
2. “true” or Eubacteria The first thing you probably think of when you say this word is “disease”- something like strep. throat or maybe an infection in a cut. Most of the bacteria that are disease causing are Eubacteria. NOTE: Only about 1% of bacteria are disease causing. NOTE: Only about 1% of bacteria are disease causing. Domain: Bacteria, Kingdom Eubacteria
Many bacteria are very helpful organisms. Actinomycetes, produce antibiotics such as streptomycin and nocardicin; others live symbiotically in the guts of animals (including humans) or elsewhere in their bodies, or on the roots of certain plants, converting nitrogen into a usable form. Bacteria put the tang in yogurt and the sour in sourdough bread; help to break down dead organic matter; & make up the base of the food web in many environments. Domain: Bacteria, Kingdom Eubacteria
“True” Bacteria: So remember- Most bacteria are beneficial Benign Benign (benign = good, friendly, kind) Pathogens Pathogens (means disease causing -only a few are “bad guys”) cocci, bacilli & spiral. Bacteria occur in 3 basic shapes: cocci, bacilli & spiral. Many are named by their shape. Domain: Bacteria, Kingdom Eubacteria biology.clc.uc.edu
Examples of common bacteria http://www.oley.org/lifeline/Probiotics.html genome.microbio.uab.edu Lactobacillus acidophilus answersingenesis.org Escherichia coli Streptococcus pneumoniae
3. Protists Made of a variety of organisms that don’t “fit” anywhere else. (Some are not very much like the others in this group.) EUKARYOTIC (has a true nucleus) 50,000 species- many unicellular, some are like fungi, some like plants or animals. Includes protozoans, unicellular algae, slime molds & water molds Domain: Eukarya, Kingdom Protista
Examples of Protists includes slime molds & protozoans like Euglena, Paramecium, Ameoba
4. Fungi Can be Unicellular or multicellular HETEROTROPHIC (eats something else) – NOT like plants (photosyntheic) (this is why they were kicked out of the plant kingdom) 100,000 species of mushrooms, puffballs, rusts, mildew & molds Domain: Eukarya, Kingdom Fungi
Fungi Examples: fcps.edu Stink horn Agaricus bisporus: The Button Mushroom http://www.mushroomexpert.com/agaricus_bisporus.html Candida albicans- can cause yeast Infections- like this mouth thrush reference.medscape.com
5. Plantae Multicellular & Photosynthetic (Autotrophs) (They make their own food & are the chief food producers of the world.) Found in all the types of environments: aquatic algae, amphibian mosses, and terrestrial ferns and seed-bearing plants. 350,000 species identified. Domain: Eukarya, Kingdom Plantae
NEXT: Dissection Notes: Squid Earthworm Frog Which are invertebrates?
Animal Kingdom, Invertebrate Phylum Annelida, Class Oligochaeta earthworm. Most familiar is the earthworm. Structure and Movement Segmented body has over 100 nearly- identical segments. Segmented body has over 100 nearly- identical segments. Circular and longitudinal muscles Circular and longitudinal muscles line the interior body wall.
Earthworms Feeding /Digestion Ingest soil as they burrow through it. Soil is moved through these structures: – mouth – pharynx – esophagus – crop – gizzard – intestine – anus Earthworms play an important role in the condition of soil.
Closed circulatory system. 5 aortic arches “Heart” is 5 aortic arches dorsal blood vessel Also- have large dorsal blood vessel pump blood through the vessels of the body Respiration and Excretion Oxygen & CO2 diffuse through moist skin, nephridia. Cellular wastes and excess water are excreted through nephridia. Neural Control Consists of a chain of ganglia connected by a ventral nerve cord.
Reproduction hermaphrodites cannot fertilize its own eggs. Earthworms are hermaphrodites, but an individual worm cannot fertilize its own eggs. During mating, earthworms press their ventral surfaces together. clitellum. Held together by their setae and by a film of mucus secreted by each worm’s clitellum. Fertilization occurs inside the tube, which forms a protective case for the young worms.
Animal Kingdom, Vertebrate Class: Amphibians The name amphibian means " double life ” -adults live on land, but their soft eggs must be laid in the water.
Characteristics of Amphibians: Metamorphosis (larval to adult) 1. Metamorphosis (larval to adult) Webbed Feet 2. Webbed Feet (if they have feet)-no claws Thin, moist skin 3. Thin, moist skin with no scales gills, lungs & skin for respiration 4.Use gills, lungs & skin for respiration - Aquatic young use gills & skin - Terrestrial adults lose gills, use lungs & skin Eggs - lack multi cellular membranes or shells 5. Eggs - lack multi cellular membranes or shells (laid in water or moist place)
Differences: amphibian eggs (left) & reptile or bird eggs (right- in waterproof shell)
American Toad Very common in North America & Pennsylvania Warty skin has a poisonous milky fluid, =protection from predators. Females lay their eggs in freshwater. Hatching occurs 3 to 12 days after, depending on the temperature of the water. The sexes can be distinguished in two ways – Males dark colored throats, of black or brown, while females have white throats and are lighter overall. – female American toads are larger than males. http://animaldiversity.ummz.umich.edu/site/accounts/information/Bufo_americanus.html
Breeding Frog and toad species – distinctive call to attract females. – fertilized eggs hatch into tadpoles & metamorphose into young frogs – EXTERNAL FERTILIZATION occurs after amplexus (pseudocopulation ) Click here to see & hear common northern USA frogs & toads (remember not to go thru firefox) http://dnr.wi.gov/org/caer/ce/eek/critter/amphibian/f rogident.htm