RLO: Using Twin and Adoption Studies

• Introduction
• Twin Studies
• Publication Bias
• Example of Twin Study
• Adoption Studies
• Advantages and Disadvantages of Adoption Studies
• Example of an Adoption Study

Example of an Adoption Study

In a study looking at classical schizophrenia, Kety and Ingraham, identified adoptees with schizophrenia and then compared the prevalence of this condition in their genetic relatives and adopted relatives. They found the prevalence of schizophrenia to be ten times higher in the genetic relatives than in the adopted relatives, thereby suggesting that inherited genetic factors had a greater influence on the development of schizophrenia than environmental factors.