3chapter16

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3chapter16

  1. 1. Gene pool <ul><li>The combination of genetic information of all the members of a particular population. </li></ul><ul><li>It contains two or more then tow alleles. </li></ul>Tenzin Chopa
  2. 2. What is relative frequency? <ul><li>It’s a comparison between the alleles that how many times they occur in gene pool and in other alleles. </li></ul>Kunchok
  3. 3. Sources of genetic variation are: <ul><li>> Mutation > Gene shuffling </li></ul>Tenzin Chopa
  4. 4. The number of variation depends on how many genes control the trait. <ul><li>- Single-gene trait - Polygenic traits </li></ul>Kunchok
  5. 5. How natural selection can effect single-gene and polygenic traits? <ul><li>It effects single gene traits by changing in allele frequency and thus to evolution. </li></ul><ul><li>It can affect the distributions of phenotypes in any of three ways: directional, stabilizing and disruptive. </li></ul>
  6. 6. Types of Selection: <ul><li>Directional: It’s when the fitness is highest at the one end of the curve than the other end or the middle. </li></ul><ul><li>Stabilizing: It’s when the fitness is higher around the middle of the curve then the either two ends. </li></ul><ul><li>Disruptive: Its when the higher fitness at the upper and lower ends than the middle. </li></ul>Tenzin Chopa
  7. 7. Diagrams of different selection: Kunchok
  8. 8. Other source of evolutionary change <ul><li>Genetic Drift: Random change in allele. </li></ul><ul><li>Founder effect: Change in allele frequencies as a result of the migration of a small subgroup of a population. </li></ul>Tenzinc Chopa
  9. 9. The Process of Speciation <ul><li>As new species evolve, populations become reproductively isolated from each other. </li></ul><ul><li>Behavioral Isolation </li></ul><ul><li>Geographic Isolation </li></ul><ul><li>Temporal isolation </li></ul>Kunchok
  10. 10. Speciation in Darwin’s Finches <ul><li>Founders Arrive </li></ul><ul><li>Separation of Populations </li></ul><ul><li>Changes in the Gene Pool </li></ul><ul><li>Reproductive Isolation </li></ul><ul><li>Ecological competition </li></ul><ul><li>Continued Evolution </li></ul>Kunchok

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