Presentation on theme: "Introduction to Zoology"— Presentation transcript:
1Introduction to Zoology Classification of Animals
2ReviewBiology is the study of life…So what makes something living?
3All living things must: Be made up of at least 1 cell that contains genetic material (DNA)Grow (increase in size, mature, develop, etc.)Metabolize (have a need and use for energy)Respond to stimuli
4That’s all fine and good, but when do we get to the animals? Zoology-the study of animalsTwo Major Categories:Vertebrates-have a backboneInvertebrates-do not have a backboneVertebrate or Invertebrate?
5Characteristics of Animals MulticellularEukaryotes (cells with nucleus & organelles)Cells do not have a cell wall or chloroplastIngestive heterotrophs (take in food and internally digest it)Store food reserves as glycogen
6Besides having the characteristics of living things, animals also: Carry out the following life processes:1.) Locomotion:motile-can move from one location to another on their ownsessile-cannot move from place to place, but do have moving partsMotileSessile
7Life Processes continued IngestionLife Processes continuedIngestion-take in foodDigestion-chemical breakdown of foodAssimilation- using the substances obtained from food and utilizing it for growthReproduction-producing offspring by mitosis or meiosisRespiration-taking in O2 and breaking down glucose to release energy
8_____________________ So now that we’ve got all these animals, how do we make sense of it all?TAXONOMY!Taxonomy-Science of classifying organisms and assigning each organism a universally accepted name.
9Linnaean Classification System Created by Carl Linnaeus ( )Before Linnaeus, organisms were classified based on their type of locomotion and physical characteristicsProblem? Names were too long, and people describe things differently.Utilizes binomial nomenclature- a twoname system (genus and species)Scientific nameEx: Homo sapiens
10Scientific Name First name is Genus; second name is species 3 Rules For Scientific NameItalicized or underlinedGenus name is CapitalizedSpecies name is lower-caseExample: Tursiops truncatus
11The Modern Classification System 7 Taxa:KingdomPhylumClassOrderFamilyGenusSpecies
12Modern Evolutionary Classification Traditional classification used physical appearances or anatomy, because they didn’t have access to modern technology.Biologists now group organisms based on evolutionary descent, not just physical similarities.These are shown with a cladogram, a diagram that shows the evolutionary relationship among a group of organisms.
14CladogramCladistic analysis identifies and considers only those characteristics of organisms that are evolutionary innovations—new characteristics that arise as lineages evolve over time.Characteristics that appear in recent parts of a lineage but not in its older members are called derived characters.
15Similarities in DNA and RNA The genes of many organisms show important similarities at the molecular level. These similarities can be used as criteria to help determine classification.DNA comparisons are useful on very different organisms such as yeast and primates, to indicate a common ancestry.DNA comparisons on similar organisms helps to establish related species.
16Molecular ClocksComparisons of DNA can also be used to mark the passage of evolutionary time.A model known as a molecular clock uses DNA comparisons to estimate the length of time that two species have been evolving independently.This is done by observing mutations in the DNANatural selection is a driving force in speciation, the formation of new species.
17The Three Domain System The three domains are:Bacteria—EubacteriaArchaea—ArchaebacteriaEukarya—Protists, Fungi, Plantae, Animalia