# Vartation

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• Created by: Jenna k
• Created on: 08-03-14 07:44
• 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