# 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

- Variation

- Sampling
- distance from mean to point of inflection

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