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Chpt. 15.2- Evidence of Change Pgs. 423-429 Pgs. 393-395
<ul><li>There are many ways scientists demonstrate how evolution might happen.  This includes </li></ul><ul><li>Comparativ...
Comparative Anatomy <ul><li>Homologous Structures-  Similar bone structures but adapted for different uses.  </li></ul><ul...
Vestigial Structures <ul><li>Vestigial Structures-  Structures that are the reduced forms of functional structures in othe...
Analogous Structures <ul><li>Analogous Structures-  Different bone structures but has the same use. </li></ul><ul><li>Ex: ...
Comparative Embryology <ul><li>Comparative Embryology-  Vertebrate embryos shows homologous structures during certain phas...
Fossils <ul><li>Fossil - any preserved evidence of an organism.  </li></ul><ul><li>6 Categories of Fossil Types </li></ul>...
Fossil Formation <ul><li>Organism dies and is quickly buried by sediment (this protects the organism) </li></ul><ul><li>Mi...
Dating Fossils <ul><li>There are 2 ways of dating fossils. </li></ul><ul><li>1.  Relative Dating-   the age of a fossil is...
<ul><li>2.  Radioactive Dating-  Using the half-life of an isotope to determine the age of a rock. </li></ul><ul><li>A  ha...
Adaptations <ul><li>Adaptation - a trait shaped by natural selection to increase the survival or reproductive success of a...
Camouflage <ul><li>Camouflage- adaptation that allows an  organism to blend in with their environment. </li></ul><ul><li>-...
Camouflage Examples
Mimicry <ul><li>Mimicry - when one species looks like  another species. </li></ul><ul><li>Ex:  California Kingsnake Vs. We...
Mimicry Example Monarch Butterfly Viceroy Butterfly Taste Bad to Predators Taste Good to Predators
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Chpt.15.2-Evidence of Change

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Transcript of "Chpt.15.2-Evidence of Change"

  1. 1. Chpt. 15.2- Evidence of Change Pgs. 423-429 Pgs. 393-395
  2. 2. <ul><li>There are many ways scientists demonstrate how evolution might happen. This includes </li></ul><ul><li>Comparative anatomy </li></ul><ul><li>Comparative embryology </li></ul><ul><li>Fossils </li></ul>
  3. 3. Comparative Anatomy <ul><li>Homologous Structures- Similar bone structures but adapted for different uses. </li></ul><ul><li>Ex: Wings on a bird, legs on a reptile </li></ul><ul><li>Used as evidence that traits were inherited from a common ancestor. </li></ul>
  4. 4. Vestigial Structures <ul><li>Vestigial Structures- Structures that are the reduced forms of functional structures in other organisms. </li></ul>
  5. 5. Analogous Structures <ul><li>Analogous Structures- Different bone structures but has the same use. </li></ul><ul><li>Ex: Wings on a bird vs. Wings on a beetle </li></ul>
  6. 6. Comparative Embryology <ul><li>Comparative Embryology- Vertebrate embryos shows homologous structures during certain phases of development but become totally different structures in adulthood. </li></ul><ul><li>Ex: Bird </li></ul><ul><li>and Mammal </li></ul><ul><li>Embryos </li></ul>
  7. 7. Fossils <ul><li>Fossil - any preserved evidence of an organism. </li></ul><ul><li>6 Categories of Fossil Types </li></ul><ul><li>Trace Fossils </li></ul><ul><li>Molds & Casts </li></ul><ul><li>Replacement </li></ul><ul><li>Petrified </li></ul><ul><li>Amber </li></ul><ul><li>Original material </li></ul>Table 14.1-Pg. 393
  8. 8. Fossil Formation <ul><li>Organism dies and is quickly buried by sediment (this protects the organism) </li></ul><ul><li>Minerals replace all or part of organisms original structure </li></ul><ul><li>Sediment hardens and turns into rock </li></ul>
  9. 9. Dating Fossils <ul><li>There are 2 ways of dating fossils. </li></ul><ul><li>1. Relative Dating- the age of a fossil is determined by its placement in layers of rock. </li></ul><ul><li>Younger layers are deposited on top. Gives an estimation of age. </li></ul>
  10. 10. <ul><li>2. Radioactive Dating- Using the half-life of an isotope to determine the age of a rock. </li></ul><ul><li>A half-life is the length of time required for half of the radioactive atoms in a sample to decay </li></ul>
  11. 11. Adaptations <ul><li>Adaptation - a trait shaped by natural selection to increase the survival or reproductive success of an organism. </li></ul><ul><li>There are two types of adaptations. </li></ul><ul><li>Camouflage </li></ul><ul><li>Mimicry </li></ul>
  12. 12. Camouflage <ul><li>Camouflage- adaptation that allows an organism to blend in with their environment. </li></ul><ul><li>-Allows to become almost invisible to predators. </li></ul><ul><li>-Results= more individuals survive and reproduce. </li></ul>
  13. 13. Camouflage Examples
  14. 14. Mimicry <ul><li>Mimicry - when one species looks like another species. </li></ul><ul><li>Ex: California Kingsnake Vs. Western Coral Snake </li></ul><ul><li>Usually used by harmless organisms to warn predators. </li></ul>
  15. 15. Mimicry Example Monarch Butterfly Viceroy Butterfly Taste Bad to Predators Taste Good to Predators
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