To study the influence of genes and the environment, use adoption studies
If children are adopted have the genes of their biological parents but an environemnt created by their adoptive parents
Adoptive children's characteristics and behaviour are measured then compared to their adoptive parents.
In adulthood the adoptive parents and the child are compared again to see whether similarities have carried on after the child has left home. (Longitudinal design)
Alternativley, this comparison can be made between the child and its biological parents.
Adoption studies are more ethical than Twin Studies to measure the role of genes (no genetic markers involved)
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