title: Does a special twin situation contribute to similarity for abilities in MZ and DZ twins?
abstract: Evidence for and against the validity of the assumption of equal environments for MZ and DZ twins is reviewed, and the consequences of possible violations of the assumption are considered. Further methods of testing the validity of the assumption, as well as possible means of correcting in part for violations, are suggested.
mesh_terms: D005260:Female; D005824:Genetics, Behavioral; D006801:Humans; D007360:Intelligence; D011247:Pregnancy; D012931:Social Environment; D014427:Twins / Q000523:psychology*; D014429:Twins, Dizygotic / Q000523:psychology*; D014430:Twins, Monozygotic / Q000523:psychology*