Abstract
A genetic model was constructed which permits direct calculation of expected genotypic fre-quencies in any generation for populations mating under mixed selfing and random outcrossing. The model is generally applicable to the case of a single diallelic locus and, under certain restrictions about the initial composition of the population, can be extended to diallelic multilocus cases. General n-step formulas are given for the one- and two-locus cases. Applications of the results to other mixed mating systems are discussed.