Twin studies and animal studies

I wrote this as part of Unit 4 Edexcel Psychology - Clinical

It includes both twin studies and animal studies describe and evaluation

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Describe and evaluate two research methods:
Twin studies and Animal studies
Describe twin studies
Researchers study MZ twins because they share 100% of their DNA, in order to
investigate the influence of genes and see if there is a genetic predisposition to
The findings from this are then compared with DZ twins who only share 50% of their
DNA, as these are likely to share the same environment but not the same genes
A concordance rate is worked out, this is the probability of one twin having the disorder if
the other already has it, expressed as a percentage
Strengths of twin studies
Is an ethical research method because nothing is being manipulated, only measured
because it is a naturally occurring event, so it won't affect the participants
The twins share the same genes, and so allow us to measure nature and nurture, the IV
is already manipulated
Weaknesses of twin studies
The twins involved in these studies are often volunteers, this means that the sample is
not generalisable as these may only be one type of person, e.g enthusiastic
MZ environment is more similar than the DZ environment, this is because they will look
more alike so they are more likely to be treated similarly, therefore the results may
actually be due to the environment of the twins
Also, it is hard to gather a large sample of twins where one has schizophrenia who are
willing to participate in research, which can lead to small samples which aren't

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Describe Animal studies
Carried out in highly controlled lab conditions
Group of genetically similar animals as a control
IV is manipulated e.g stressful environment
DV is measured, e.…read more


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