Variation

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  • Variation
    • If members of the same species differ this is called INTRASPECIFIC VARIATION
    • Sampling involves taking measurements from individuals of the population being investigated
      • Samples must be representative of the whole population
        • May not be representative due to SAMPLE BIAS or CHANCE
          • CHANCE = the individuals chosen may not be representative
      • The best sampling technique is RANDOM SAMPLING
        • for example LINE TRANSECT or BELT TRANSECT
      • Best results are taken if there is a LARGE SAMPLE SIZE
    • Causes of Variation
      • Genetic differences
        • MUTATIONS
        • MEIOSIS
        • FUSION OF GAMETES
      • Environmental Influences
        • CLIMATE
        • TEMPERATURE
        • SUNLIGHT
        • SOIL QUALITY AND PH
    • Mean and Standard Deviation
      • MEAN = the measurement at the maximum height of the curve
        • does not provide data about the range of values
      • STANDARD DEVIATION = the width of the curve
        • gives an indication of the range of values either side of the mean
      • NORMAL DISTRIBUTION CURVE = environmental factors influencing variation shown on a graph

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