A complementary finding, from a completely different methodology, is that adopted siblings reared together -- the mirror image of identical twins reared apart, they share their parents, their home, their neighborhood, don't share their genes -- end up not similar at all.
Paralleelne järeldus, tuletatud hoopis teise metoodikaga, on see, et koos kasvatatud adopteeritud õed-vennad - peegelpilt olukorrast, kus identsed kaksikud on eraldi kasvatatud, neil on samad vanemad, kodu, naabruskond, aga geenid pole ühised - ei kasva üleüldse sarnasteks.