Abstract
Sympatric speciation is studied in population polymorphic in one polygenic character. Individuals with different marginal phenotypes are reproductively isolated. The final stage of speciation is investigated when the number of the forming species greatly exceeds the total number of intermediate individuals, which allowed the set of equations describing our population to be reduced to a set of linear equations. The final stage of speciation appears to be critical and determines the output of the process. The force of disruptive selection necessary to complete the speciation has been found under various conditions (namely, the number of loci, different types of selection, and assortative mating). Our model shows that sympatric speciation is possible under a wide range of quite realistic conditions, which supports the hypothesis about its possibility in nature. Relative frequencies of the intermediate phenotypes containing much information about the main factors of speciation are also found.
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