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Module 12 lesson 2


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Module 12 lesson 2

  1. 2. <ul><li>1. Stabilizing </li></ul>Favors average individuals in the population Reduces variation of individuals in a population http://Muskopf, Shannan. Online Images. The Biology Corner . 13 May 2007.
  2. 3. <ul><li>Favors 1 extreme of individuals in the population </li></ul><ul><li>Those having the extreme trait survive and reproduce </li></ul><ul><li>Causes the population to move in one direction because more individuals have the trait </li></ul>Muskopf, Shannan. Online Images. The Biology Corner . 13 May 2007.
  3. 4. <ul><li>Favors either extreme of individuals in the population (unlike directional selection which favors one extreme ) </li></ul><ul><li>Those 2 extremes of the population survive and reproduce </li></ul><ul><li>Leads to no intermediate (average) form of the trait </li></ul><ul><li>Two new species evolve </li></ul>Online Images. Biofundamentals . 13 May 2007.
  4. 5. Muskopf, Shannan. Online Images. The Biology Corner . 13 May 2007.
  5. 6. Organisms from the same species develop different traits to survive their environment. Adaptive Radiation: This is a type of divergent evolution where a species evolves to fit into an open niche.
  6. 7. <ul><li>Causes of speciation: </li></ul><ul><ul><li>Behavioral Isolation: occurs when two species have different courtship behaviors (males have courtship songs or dances that will only be recognized by females of the same species) </li></ul></ul><ul><ul><li>Geographic Isolation – physical barrier (river, mountain) prevents contact between individuals and leads to speciation </li></ul></ul>
  7. 8. Spotted owl subspecies living in different geographic locations show some genetic and morphological differences. This observation is consistent with the idea that new species form through geographic isolation .
  8. 9. These organism are not from the same species, and they are not related. They developed similar adaptations because they have the same niche. They all eat ants.
  9. 10. Yucca flowers are a certain shape so that only the yucca moths can pollinate them.