9/13/2023 0 Comments Colorado adoption project findingsOne of the first longitudinal studies ( Skodak & Skeels, 1945) avoided the first problem but also did not include environmental measures and was undertaken at a time when deliberate selective placement was still prevalent. Theis, 1924) were retrospective, did not include environmental measures, and did not control for selective placement. The first systematic studies from early in the previous century (e.g. The adoption design has a long history, and an interesting present. If the design includes multiple offspring in the rearing families, sibling analyses comparing related and unrelated siblings are also possible. In the adoption study we can contrast the resemblance between parents and children who share only environmental resemblance (rearing parents with adoptees) as well as the resemblance between parents who share only genetic background (birth parents with adoptees) and compare these to control parents and children who share both ( Plomin, DeFries, McClearn, & McGuffin, 2008). Like twin studies, adoption studies provide estimates of genetic and environmental influences, but the adoption design may include both parent-offspring and sibling comparisons. As subjects assessed first at age 1 approach age 40, we hope the CAP will establish itself as the first prospective adoption study of lifespan development.Ī behavioral genetic design that compliments the more prevalent twin designs discussed in this special issue is the adoption design. Findings from some representative papers that make use of data from CAP participants illustrate the study’s multifaceted nature as a parent-offspring and sibling behavioral genetic study, a study that parallels a complimentary twin study, a longitudinal study of development, a source of subjects for molecular genetic investigation, and a study of the outcomes of the adoption process itself. The paper provides an overview of CAP’s history, how subjects were ascertained, recruited, and retained, and the domains of assessment that have been explored since the CAP’s initiation in 1975. We describe the features of the adoption design used in CAP, and discuss how this type of design uses data from both parent-offspring and related- versus unrelated- sibling comparisons to estimate the importance of genetic and shared environmental influences for resemblance among family members. This paper describes the Colorado Adoption Project (CAP), an ongoing genetically-informative longitudinal study of behavioral development.
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