Variation - Chapter 7 AQA AS Biology

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  • Created by: H.N
  • Created on: 09-11-12 19:06
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  • Intraspecific - differences within a species
  • Genetic factors
    • due to different genes an organism possesses
    • arises due to; mutation, meiosis, fusion of gametes
    • no intermediate types, organisms fit into distinct forms
    • controlled by SINGLE gene
    • pie chart/bar graph
  • Variation
    • Interspecific variation - different species
    • Intraspecific - differences within a species
    • The mean
      • maximum height of the normal distribution curve
      • provides average value
      • doesn't show ranges
      • can tell variation between samples
    • Environmental influences
      • normal distribution curve
      • POLYGENES
      • form a continuum
      • where the limits lie - set by genes
      • influences the way an organisms genes are expressed
    • Genetic factors
      • due to different genes an organism possesses
      • arises due to; mutation, meiosis, fusion of gametes
      • no intermediate types, organisms fit into distinct forms
      • controlled by SINGLE gene
      • pie chart/bar graph
    • Standard variation/deviation
      • width of the normal distribution curve
      • tells you how much the values in a SINGLE sample varies
      • large standard deviation = sample values a lot
      • small standard deviation = little variation - most data around the mean
      • measure of the spread of values about the mean
  • Bias  - removed by random sampling
    • Sampling
      • Variation
        • Interspecific variation - different species
        • The mean
          • maximum height of the normal distribution curve
          • provides average value
          • doesn't show ranges
          • can tell variation between samples
        • Environmental influences
          • normal distribution curve
          • POLYGENES
          • form a continuum
          • where the limits lie - set by genes
          • influences the way an organisms genes are expressed
        • Standard variation/deviation
          • width of the normal distribution curve
          • tells you how much the values in a SINGLE sample varies
          • large standard deviation = sample values a lot
          • small standard deviation = little variation - most data around the mean
          • measure of the spread of values about the mean
      • chance - removed using large sample and analysing collected data
  • distance from mean to point of inflection

    Comments

    fadhiah

    Can you make these mindmaps for chapter 1,2,3,4,5 & 6 Please they're really helpful!

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