02 evidence of evolution comparative anatomy

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02 evidence of evolution comparative anatomy

  1. 1. Evidence of Evolution: Comparative Anatomy
  2. 2. Comparative Anatomy Similarities in the basic pattern of anatomy is evidence of inheritance from a common ancestor: i) Homologous Structures ii) Analogous Structures iii) Vestigial Structures
  3. 3. Comparative Anatomy i) Homologous Structures: • Body parts of different species with similar structures but different functions. • Evidence of close evolutionary relationship (recent common ancestor).
  4. 4. Comparative Anatomy Homologous Structures
  5. 5. Comparative Anatomy ii) Analogous Structures: • Body parts of different species with similar functions but different structures. • No evolutionary relationship. Australian squirrel glider North American chipmunk
  6. 6. Comparative Anatomy Though this marsupial and placental mammal look very similar, they are distantly related. Their methods of gestation and birth are analogous. Australian squirrel glider North American chipmunk Marsupial Placental mammal
  7. 7. Comparative Anatomy Analogous Structures The coloured bones are homologous. The thin membrane of an insect's wing is analogous to feathers or leathery flesh.
  8. 8. Comparative Anatomy iii) Vestigial Structures: • Structures of little or no use. • These are remnants of structures in an ancestral species that had a use for them. Humans no longer have an inner eyelid - a structure similar to the one on cats but we still have the remnants of one (don't worry, she's not hurting the cat).
  9. 9. Comparative Anatomy Vestigial Structures on Humans plica semilunaris + goosebumps
  10. 10. Comparative Anatomy iii) Vestigial Structures: Some whale fossils have hind leg bones.
  11. 11. Comparative Anatomy iii) Vestigial Structures: The cave fish (on the right) is blind, yet it still has eyes.
  12. 12. How is Comparative Anatomy Evidence of Evolution?

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