Component | Cross-twin correlation | Cross-trait cross-twin correlation |
---|---|---|
Additive genetic (A) | MZ correlation is higher than the DZ correlation | MZ correlation is higher than the DZ correlation |
Shared environmental (C) | DZ correlation is greater than half the MZ correlation | DZ correlation is greater than half the MZ correlation |
Nonshared environmental (E) | MZ correlation is lower than 1 | MZ correlation is lower than the phenotypic correlation |