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Learning Target : Evidence of Evolution. I Can … Describe reasons that provide evidence that evolution occurred throughout the past I Will … Explain and give examples of evolutionary evidence from: Fossil record Biogeography Embryology Anatomy Homologous structures Analogous structures

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slide1

Learning Target:

Evidence of Evolution

  • I Can… Describe reasons that provide evidence that evolution occurred throughout the past
  • I Will…
  • Explain and give examples of evolutionary evidence from:
    • Fossil record
    • Biogeography
    • Embryology
    • Anatomy
      • Homologous structures
      • Analogous structures
      • Vestigial structures
slide2

Evidence of Evolution: Natural Selection

  • Natural Selection – Mechanism of how evolution (genetic change over time of a population) happens.
  • Genetic variation
  • Selective pressure
  • Environment
  • Adaptation (advantage for survival and/or reproduction)
  • Right before our eyes
  • Dog breeds
  • Antibiotic resistant bacteria
  • Peppered moths
  • But, life has been around for a very long time
slide3

Evidence of Evolution: Fossil Record

  • Fossil – traces of organisms that existed in the past mineralized over time
  • “Rock snapshot of organisms in the past”
  • Fossil records shows:
  • Types of organisms
  • Structure of the organism
  • Location, ecosystem they lived in
  • Age (when they lived)
    • Rock layers
      • Deeper = older
      • Radioisotope dating of surroundings
      • Organisms that have become extinct
      • Changes in populations over time
slide4

Evidence of Evolution: Geography

  • Biogeography – study of the distribution of organism around the world
  • Organisms from different areas show similarities
  • Past migration from common population
  • New ecosystems exert selective pressure
  • Adaptations over time
  • Geography can isolate groups
    • Prevents mating between separated groups
      • Galapagos Finches
slide6

Evidence of Evolution: Embryology

  • Embryology – Comparative anatomy study of embryo stage of development in organisms
  • Different looking adults can have very similar embryo stage
  • Fish, birds, reptiles, mammals
    • All have gill slits in embryo stage
    • Develops into throat and ear structures in mammals
      • Strong evidence of common ancestor
slide8

Evidence of Evolution: Anatomy

  • Anatomy – study of structure
  • Homologous structures
    • Similar structures with different function
      • Result of selective pressure
      • Strong evidence of common ancestor
slide10

Evidence of Evolution: Anatomy Analogous

  • Analogous structures –
  • Different structures with similar function
  • Selective pressure, such as need for flight, forced similar traits in different organisms
slide11

Evidence of Evolution: Anatomy Analogous

Homologous structures

Analogous structures

slide12

Evidence of Evolution: Anatomy Vestigial

  • Vestigial structures –
  • Remnants of organs or structures that had a function in an ancestor, but no longer function in present day descendants
  • Very strong evidence for evolution and change over time as selective pressures change
slide13

Evidence of Evolution: Anatomy Vestigial

Snakes –

Also had a common tetrapod ancestor