Bio lab practical

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Author:
Bhochman
ID:
70865
Filename:
Bio lab practical
Updated:
2011-03-05 13:20:52
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papa smurfy
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Description:
Part 1 for practical exam
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  1. What is directional selection?
    Occurs when conditions favor those exhibiting one extreme of a phenotypic range. This is common when a populations environment changes of member migrate to a new habitat.
  2. What is Diruptive Selection?
    Occurs when conditions favor those at both extremes of a phenotypic range. This could happen from an middle food source disappearing. From avg. seeds to small and large seeds.
  3. What is Stabilizing Selection?
    Acts against both extreme phenotypes and favors the middle. This reduces variation and tends to keep status quo.
  4. What is the purpose of sampling with replacement during some of the Hardy-Weinberg lab activities?
    To show how random chance does not alter a population over time. This method does not allow gene flow, but does allow for allelic frequency to stay the same.
  5. If chi-square is less than that in the table then?
    You have sampled an accurate scenario within your expected results.
  6. Requirements for Hardy-Weinberg?
    • No Mutations
    • Random Mating
    • No Natural Selection
    • Extremely Large Population size
    • No Gene Flow
  7. Two compounds that typically surround the cell membrane of bacterial cells?
    • Lipopolysaccharide
    • Pertidoglycan
  8. What are the three characteristics used to describe a bacterial COLONY in identifying species of bacteria?
    • Shapes
    • Margins
    • Surface Characteristics
  9. Types of Common colony shapes of bacteria?
    • Punctiform
    • Round
    • Filamentous
    • Irregular
  10. Types of Common colony margins of bacteria?
    • Smooth
    • Curled
    • Wavy
    • Lobate-(like an irregular wavy)
    • Filamentous
  11. Types of Common bacterial colony surface characteristics?
    • Smooth
    • Concentric
    • Wrinkled
    • Contoured
  12. What are the three basic shapes of bacteria
    • Bacilli
    • Cocci
    • Spirilla
  13. Describe Prokaryotic nature of bacterial Cell.
    No true nucleus, no membrane bound organelles, reproduce by binary fission

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