Vartation

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  • Created by: Jenna k
  • Created on: 08-03-14 07:44
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  • Variations
    • Key words
      • Intraspecification
        • When members of the same species differ form one another.
      • Interspecification
        • When one species differs form another
    • Variation occurs between members of the same species and between species.
    • Sampling
      • Sampling bias
        • There may be conditions that are not included in samples as they are harder to get to or less pleaseant.
      • Chance
        • Our sampling methods may lead to unrepresentative data as our choices of specimens are down to chance.
      • Random Spamling
        • This method would eliminate biases and make the sample more representative.
          • Method of random sampling.
            • 1) Section off the area in to metre squared areas
              • 2) Use ramdomly generated numbers to pick which quadrants you are going to sample form.
                • 3) Take samples at each of these quadrants and you will have representative data
            • 3) Take samples at each of these quadrants and you will have representative data
    • Normal Distrabution
      • Standard deviaiton
        • Standard deviation shows the spread of data and the deviation from the mean.
        • You will not have to work t out just know what it is and how the advantages of it.
      • Mean
        • As you know the mean is all the numbers added up and divided by the amount of numbers.
        • This method does not tell you about the range of values but it does illustrate the spread of data.
    • Causes of variation
      • Genetic factors
        • Mutations
          • Sudden changes to the genes or chormosomes that may be passed on to offspring.
        • Miesos
          • When Gametes are formed (Sex Cells) the DNA is all mixed up.
        • Fusion of Gametes
          • When fertilisations occurs the fusion of two different ganetes casue huge changes.
      • Environmentat infulences
        • Climate, pH conditions, temperature, light, food sources affect the growth of a plant.
        • They don't dictated the ability of the genes but they do control how effective the genes can be in an environment.
      • Both

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