Evolution into


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  • Complex species have developed from simpler species because organisms are always striving to better adapt themselves to their physical surroundings
  • A species is a distinct classification of a plant or animal
    Our Place…taxonomy
  • Evolution governed by natural laws.
    Evolution based on the acquisition of acquired traits.
    Giraffe has a long neck because it needs to stretch to reach food.
    Didn’t believe that the population died off (natural selection)
  • His two most famous books were “On the Origins of Species” and “The Descent of Man”
  • Animals with certain physical characteristics that help them to survive in their given environment will live longer and produce more offspring. This will lead to that certain characteristic becoming a dominant trait of that species
    Animals with good “survival equipment” are better “fitted” to live in their physical environment. They will live long and pass this “equipment” on to other members of the species
  • Random acts sometimes you win…sometimes you lose…
    How our genes are passed on.
  • http://www.randommutation.com/darwinianevolution.htm
  • Peppered Moth…polluted areas vs. unpolluted areas.
  • Within a population:It can introduce or reintroduce genes to a population, increasing the genetic variation of that population.
    Across populations:By moving genes around, it can make distant populations genetically similar to one another, hence reducing the chance of speciation. The less gene flow between two populations, the more likely that two populations will evolve into two species.
  • Evolution into

    1. 1. Taxonomy System of classification
    2. 2. Carl Linnaeus Swedish scientist 1707-1778 Developed a system of classifying animals called Binomial Nomenclature • 2 names
    3. 3. Classification Kingdom Phylum Class Order Family Genus Species
    4. 4. Any sayings you can think of to remember that? King Phillip Came Over For Great Sex
    5. 5. Human Taxonomy Animal Chordate Mammal Primate Hominid Homo sapien
    6. 6. Evolution: What ’s all t he f uss about ? Terms and I deas you need t o know.
    7. 7. Understanding Evolution Evolution is the process of change in species over time. A species is a distinct kind of animal…
    8. 8. Evidence of Evolution Some evidence of evolution are homologies and vestigial organs Homologies are structural likenesses between parts of different organisms. • Examples: arm = flipper = wing. Vestigial organs are any part of an organism that no longer serves a useful function. • Example: human appendix
    9. 9. Jean-Baptiste Lamarck (1744-1829) First to use the term Biology as we use it today. Early, first, proponent of evolution.
    10. 10. Charles Darwin (1809-1882) Charles Darwin English scientist advanced the theory of evolution Proposed natural selection. Conducted his primary research on the Galapagos Islands.
    11. 11. What is this idea called Natural Selection? Certain physical traits help animals survive eventually become the dominant trait The better “fit” species lives longer and passes their helpful physical traits on to offspring Thus the struggle for existence results in the “survival of the fittest”
    12. 12. WHAT IS BIOLOGICAL EVOLUTION? Change in a species over time.
    13. 13. What can trigger these changes? Mutations Random Genetic Drift Gene Flow
    14. 14. Mutations A sudden change in the make-up of the gene or chromosome that brings a new trait into existence. Can be helpful or harmful. Very rare to actually help a species
    15. 15. Random Genetic Drift When a group passes on it’s genetic code to the next generation not all genes are passed on… More genetic combinations than offspring...not all genes are passed on
    16. 16. Gene Flow The transfer of hereditary characteristics from one breeding group to another. Within Population Across Population