Abstract
The neutral gene flow among populations of higher plants in the presence of a simple zygotic isolating mechanism is studied theoretically. Partial reproductive isolation is caused by a gene subject to selection. The population model is an island model with very small interpopulation migration rates. General solutions have been obtained and verified by numerical tests. It has been observed that the reduction of gene flow caused by the isolating mechanism is stronger—other things being equal—for: (1) greater intensity of selection; (2) lower values of the frequency of recombination between the selected locus and the neutral locus; (3) higher values of the level of partial self-fertilization. The last result is particularly interesting and needs to be considered in discussing speciation processes in plants with high rates of self-fertilization.
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