Abstract
Longitudinal behavioral genetic studies provide an opportunity to analyze both developmental change and continuity, the two essential issues addressed by developmental behavioral genetics. Longitudinal analysis can be viewed as multivariate analysis, thus profiting from recent advances made in that area. Moreover, the major multivariate concepts of genetic correlation and bivariate heritability assume added significance in longitudinal analyses: They connote age-to-age genetic continuity and change. In this paper, the relationship between multivariate and longitudinal analyses is discussed, the meaning of age-to-age genetic change is examined at the level of molecular genetics as well as quantitative genetics, and the implications of age-to-age genetic change for familial resemblance are considered in the context of parent—offspring data from the Colorado Adoption Project, which can be viewed as an “instant” longitudinal study from infancy to adulthood.
Published Version
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