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787909
Variation
Description
Summary of the chapter on variation in the AQA AS Biology textbook
No tags specified
aqa
as
biology
variation
meiosis
species
sampling bias
random sampling
environmental influences
genetic factors
normal distribution
mean
standard deviation
biology
a levels
Mind Map by
emilyorr97
, updated more than 1 year ago
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Created by
emilyorr97
over 10 years ago
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Resource summary
Variation
Sampling
Large sample size
More reliable data
smaller probability of chance occurring and influencing the results
Data analysis
statistical tests to determine the extent to which chance may affect the data
Chance
pure chance that the individuals are not representative
Sampling bias
random sampling is the best way to prevent sampling bias
unrepresentative choices either deliberately or unwittingly
Genetic factors
Mutations
sudden changes in the genes may be passed on to offspring
Meiosis
mixes genetic material before fertilisation so all gametes are different
Fusion of gametes
offspring inherit some characteristics from each parent, therefore are different
which gametes fuse is a random process, further adding to the variety of offspring that two parents produce
Environmental influences
affect the way that the organism's genes are expressed
Classification of characteristics
Due to genetic factors
a few distinct forms - no intermediate types
Due to environmental influences
form a continuum. e.g. height and weight
can be plotted on a normal distribution curve (bell-shaped)
Normal distribution
Mean
measurement at the maximum height of the curve
Standard deviation
measure of the width of the curve
Types of variation
IntERspecific variation
the difference between species - a giraffe isn't the same as a sloth
IntRAspecific variation
the difference within a species - no two humans are the same
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