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3chapter16

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Transcript

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