Which research method allows researchers to most easily isolate the effect of both genetics and experience on specific traits

Question

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Adoption studies allow researchers to compare similarities and differences between adopted children and their biological parents (genetics) as well as their adoptive parents (experience) in relation to specific traits. This allows researchers to more easily isolate the effect of both genetics and experience on these traits. Twin studies and family studies can also provide information on genetics, but they cannot disentangle genetic and environmental influences as well as adoption studies can. Survey studies may provide information on behavior, but they do not focus on specific traits or isolate genetic and environmental factors.

Which Research Method Allows Researchers to Most Easily Isolate the Effect