Genetic and Environmental Influences on Human Behavioral Differences
ABSTRACT Human behavioral genetic research aimed at characterizing the existence and nature of genetic and environmental influences on individual differences in cognitive ability, personality and interests, and psychopathology is reviewed. Twin and adoption studies indicate that most behavioral characteristics are heritable. Nonetheless, efforts to identify the genes influencing behavior have produced a limited number of confirmed linkages or associ...
Effect of Genetic and Environmental Factors on Writing Development
ABSTRACT Researchershaveidentifiedsourcesofindividualdifferencesinwritingacrossbeginninganddevelopingwriters. Theaimofthepresentstudywastofurtherclarifythesourcesofthisvariabilitybyinvestigatingtheextentto whichtherearedifferencesingeneticandenvironmentalfactorsunderlyingtheassociationsbetweenlexical diversity,syntacticknowledge,andsemanticcohesionknowledgeinrelationtowriting.Differenceswereexaminedacrosstwodevelopmentalphasesofwriting:beginning(i.e.,elementaryschool)anddeveloping(i.e.,�...