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A researcher conducts a study on adults who were adopted as infants. The study finds that the likelihood of an adoptee developing schizophrenia is significantly higher if their biological parent has the disorder, even if their adoptive parents do not. Conversely, the likelihood is not significantly increased if an adoptive parent has the disorder but the biological parents do not. What does this pattern of results most strongly suggest?
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Gene-Environment Interaction in Schizophrenia: The Tienari et al. (2004) Study
Heston's (1966) Adoption Study on Schizophrenia
A researcher conducts a study on adults who were adopted as infants. The study finds that the likelihood of an adoptee developing schizophrenia is significantly higher if their biological parent has the disorder, even if their adoptive parents do not. Conversely, the likelihood is not significantly increased if an adoptive parent has the disorder but the biological parents do not. What does this pattern of results most strongly suggest?