Variation
- Created by: Ellie Rivers
- Created on: 16-03-13 13:14
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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
- May not be representative due to SAMPLE BIAS or CHANCE
- 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
- Samples must be representative of the whole population
- Causes of Variation
- Genetic differences
- MUTATIONS
- MEIOSIS
- FUSION OF GAMETES
- Environmental Influences
- CLIMATE
- TEMPERATURE
- SUNLIGHT
- SOIL QUALITY AND PH
- Genetic differences
- 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
- MEAN = the measurement at the maximum height of the curve
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