Abstract
The exact solution for the process of random genetic drift in a triallelic locus has been obtained by solving the partial differential (Kolmogorov forward) equation based on a continuous model: The probability distribution of gene frequencies in the unfixed classes where all the three alleles coexist indicates that the distribution surface finally becomes flat and decreases in height at the rate of 3/(2N) per generation. Extension of the present method to cases with more than three alleles has been discussed.