It may help to have the set of keywords that will yield better search results. Geneticists generally assume that every trait is determined by a combination of G

It may help to have the set of keywords that will yield better search results. Geneticists generally assume that every trait is determined by a combination of Genes and Environment (GxE), and the differences between fraternal and identical twins are used to determine what component is heritable/genetic and what component is environmental.