Power curves of the test statistics FABC,a and FABC,ad and FHTR of the haplotype trend regression method against the heritability h2 at a 0.05 significance level, when three diallelic markers A, B, and C are used in the analysis. (A and C) The curves are plotted for a dominant mode of inheritance a = d = 1.0; (B and D) the curves are plotted for an additive mode of inheritance a = 1.0, d = 0. (A and B) The parameters are given by DAQ = DBQ = DCQ = DDQ = 0.12, DAB = DAC = DBC = 0.08; (C and D) the parameters are given by DAQ = DBQ = DCQ = DDQ = 0.10, DAB = DAC = DBC = 0.06. Neither third- nor fourth-order linkage disequilibrium is assumed among markers and the QTL. The other parameters are and N = 200.