Edexcel A-Level Psychology 9PS0
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Biological Psychology
Twin and adoption studies
- 3 things to know
- Papers 1 and 3
Overview
Recall questions on MZ and DZ concordance, Gottesman and Shields on schizophrenia, the equal environments assumption and selective placement, Heston's (1966) adoption study in detail, and Ludeke et al.'s heritable obedience to traditional authority.
What you need to know
Answer each one before you reveal it.
What is selective placement and why is it a limitation of adoption studies?
What percentage of genes do monozygotic twins share?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What percentage of genes do monozygotic twins share?
Model answer
100% of their genes
- 2
Approximately what percentage of genes do dizygotic twins share?
Model answer
Approximately 50% of their genes
- 3
In a twin study, what does it suggest if concordance rates are higher in MZ twins than DZ twins?
Model answer
It suggests a genetic influence on the behaviour or condition being studied
- 4
In an adoption study, what does it suggest if adopted children are more similar to their biological parents than their adoptive parents?
Model answer
It suggests a genetic influence on the behaviour being studied
- 5
What condition did Gottesman and Shields (1966) investigate in their twin study?
Model answer
Schizophrenia
- 6
What did Gottesman and Shields (1966) compare in their study?
Model answer
Concordance rates for schizophrenia in monozygotic and dizygotic twins
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