As predicted, the overall the model (R2 = 0.29, F(7, 70) = 4.06, p < 0.001) and the interaction were significant (b = 1.15, t = 3.15, p = 0.002): Adoptive mothers with temperamental NA and being carrier of DRD4-7 repeat allele, significantly assessed their children as showing more emotional and behavioral problems (age at adoption as high: b = 33.36, t = 3.99, p < 0.001). This evidence concerns the gene DRD4 and Atypical behavior.