title: Differential heritability across levels of cognitive ability.
abstract: Differences in heritability and shared environmentality across levels of cognitive ability were assessed in a sample of 264 twin pairs tested at 1 year of age and in subsets tested at 2 and 3 years. Using an extension of the DF multiple regression methodology for analyzing twin data, no evidence was found for a linear or quadratic effect of level of cognitive ability on estimates of heritability or shared environmentality.
authors.affiliation: Institute for Behavioral Genetics, University of Colorado, Boulder 80309-0447.
authors.forename: S S
authors.initials: SS
authors.lastname: Cherny
authors.forename: L R
authors.initials: LR
authors.lastname: Cardon
authors.forename: D W
authors.initials: DW
authors.lastname: Fulker
authors.forename: J C
authors.initials: JC
authors.lastname: DeFries
mesh_terms: D001076:Aptitude; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007360:Intelligence / Q000235:genetics*; D008297:Male; D008957:Models, Genetic; D012931:Social Environment; D014429:Twins, Dizygotic / Q000235:genetics* / Q000523:psychology; D014430:Twins, Monozygotic / Q000235:genetics* / Q000523:psychology