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Causes and Evidence of Evolution. Objective 3.05: Evidence of the theory of evolution. Causes of Evolution. Natural Selection Mutations Competition Geographic Isolation. Example of Geographic Isolation. Beetle population divided by a river.

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causes and evidence of evolution

Causes and Evidence of Evolution

Objective 3.05:

Evidence of the theory of evolution

causes of evolution
Causes of Evolution
  • Natural Selection
  • Mutations
  • Competition
  • Geographic Isolation
example of geographic isolation
Example of Geographic Isolation
  • Beetle population divided by a river.
  • Both groups of beetles become different because they adapt to their new (different) environments.
  • Even if reunited, they would not mate with each other again because they have evolved genetically and behaviorally into two different species (speciation)!
5 pieces of evidence
5 Pieces of Evidence
  • Anatomy
  • Embryo Comparison
  • Biochemical (DNA)
  • Adaptations
  • Fossils
  • Inherited traits that aid in survival
    • Mimicry: Acts like another organism or pretends to be a harmful predator.
    • Camouflage: Blends in for better survival
    • Antibiotic/Pesticide Resistance: Some bacteria do not respond to drugs which means they are able to survive and multiply!
antibiotic resistance
Antibiotic Resistance
  • Normal H. pylori bacteria produces an enzyme that activates an antibiotic.
  • That mixture creates a “poison” to the bacteria and kills it.
  • The bacteria mutates to not produce the enzyme.
  • Evidence of once living organisms.
    • Can be:
    • Bones
    • Footprints
    • Imprints
  • Fossil Record: The history of life on Earth as shown by fossils preserved in rocks.
    • Shows:
    • How species changed over time
    • If any species go extinct
  • The Geologic Time Scale is based on the Fossil Record.
age of fossils
Age of Fossils
  • Relative Age:One fossil is older/younger than another based on rock layers.
    • Does not tell exact age.
age of fossils1
Age of Fossils
  • Absolute Age: The more exact age of a fossil.
    • Based on decay of organisms (Carbon Dating)
    • Use half life to determine age
    • Half Life: Time it takes for half the atoms to decay.