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. Author manuscript; available in PMC: 2017 Jan 11.
Published in final edited form as: Behav Genet. 2012 Feb 15;42(4):549–558. doi: 10.1007/s10519-012-9527-0

Figure 1.

Figure 1

Panel A (left): Cross-sectional Gene × Environment Model. This model tests for a gene × environment interaction on a phenotype (e.g. mental ability at a single point in time). Panel B (right): Longitudinal Gene × Environment Interaction Model. This model can be used to test whether gene × environment interaction on school readiness at 4 years can be accounted for by gene × environment interaction on mental ability at 2 years. In both panels, for ease of presentation, only one twin per pair is represented.