DYNAMICS OF CYTONUCLEAR DISEQUILIBRIA IN SUBDIVIDED POPULATIONS

The purpose of this report is to understand the effects of hybrid zone architecture and genetic drift on cytonuclear genotypic disequilibria . We also study the exact dynamics of the expected values of the cyton uclear genotypic disequilibria for both the homozygotes and heterozygo tes in a finite population containing reproductively isolated subpopul ations under random drift alone and random drift along with mutation, respectively. We study the dynamics of the between-population componen t of the disequilibrium for the homozygotes. The dynamics of the varia nces of these disequilibria under the random drift model are studied b y Monte Carlo simulations. The asymptotic formulas for both the expect ations and variances are obtained. The results are contrasted with tho se for a single undivided population and their biological significance s are discussed. Approximate normality of the disequilibria measures a re also demonstrated by Monte Carlo simulations. (C) 1998 Academic Pre ss Limited.