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Evidence for evolution powerpoint
 

Evidence for evolution powerpoint

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    Evidence for evolution powerpoint Evidence for evolution powerpoint Presentation Transcript

    • Evolution: Evidence SC.912.L.15.1 Explain how the scientific theory of evolution is supported by the fossil record, comparative anatomy, comparative embryology, biogeography, molecular biology, and observed evolutionary change
    • Types of Evidence we will be covering
      • Fossil Records
        • Transitional fossils
      • Comparative Anatomy
        • Homologous Structures
        • Analogous Structures
      • Vestigial Structures
      • Biogeography
    • Fossil Records
      • Fossils support the idea of evolutionary progression.
      • By looking at fossils Paleontologists/zoologists can:
        • Identify extinct animal species
        • Follow the path of evolution through different stages of development
        • Evolution of the Whale
    • Key Points of the Fossil Record
      • Provides evidence of evolution from one species to another
        • Shows ancestral intermediates
      • Only hard tissue is preserves
      • Fossil Formation
    • Transitional Fossils
      • FLASH CARD ALERT:
          • TRANSITIONAL FOSSIL: fossils that show transitions in evolution.
      • Transitional fossils are RARE findings
        • Small proportion of organisms become fossils
        • Many fossils represent dead evolutionary branches
    • Support: Comparative Anatomy
      • Homologous Structures: Similar features found in different species that are derived (come from) a common ancestor
        • Ex. Tetrapod limbs, fur, lungs
      • Bone formation: developmental and evolutionary similarities
      • Evidence of intermediates
    •  
    • Analogous Structures
      • FLASH CARD ALERT:
      • Analogous Structures: a trait or an organ that appears similar in two unrelated organisms
      • Happens because of convergent evolution:
        • FLASHCARD ALERT: CONVERGENT EVOLUTION: Species evolve in similar environments and have similar environmental stressors/survival factors
    • Analogous Structures
    • Vestigial Structures
      • Vestigial Structures : characteristics found in existing species that have no known function
      • Provide evidence of common ancestry
      • As species evolve their structures change
        • Two things will happen
          • Species will adapt the organ/structure to a new use
            • penguin
          • The organ or structure will no longer have a use
            • Whale pelvis/snake feet.
    • Useless for Flying but excellent for swimming
    • Vestigial Structures
      • Stubs on pythons, boas, and other snakes
        • Ancestral legs
          • No known
          • function
      • Useless Vestigial structures are BETTER sources of evidence for evolution
    • Amphiuma
    •  
    • Flightless Wings
    • Plica semilunaris
    • CFU:
      • What is the major difference between analogous and homologous structures?
      • What structure is the best evidence of evolution: analogous, homologous or vestigial
      • What kind of tissue/part of an animal is preserved in fossils?
      • What type of fossils are paleontologists most interested in?
        • Why are they hard to find?
    • Comparative Embryology
      • Incredible similarities in embryos of different species provides evidence of common ancestor
        • Patterns of embryo development are also important.
    • Biogeography
      • Zoologists seek to understand how very closely related species ended up in completely different parts of the world
    • Support for Pangaea
    • Key Point of Biogeography
      • Seeks to answer the question: how/why different but similar species exist in similar yet separate parts of the world
      • Can be explained by geological changes, migrations, convergent evolution
      • Support ideas of common ancestor and Pangaea
    • EVOLUTION CFU
      • What are the five steps of evolution?
      • How does the environment affect the process of evolution?
      • Adaptations help the organism:
      • The three types of structures that support evolution are:
      • Paleontologists are excited to find what kind of fossil and why?