Gene Frequency Distributions and Random Drift in Geographically Structured Populations
In chapters 9 and 10, we dealt with problems that permit exact solutions, either because of the simplicity of the problem, or of the population, or because of invariance principles. In this chapter we deal with problems whose exact solutions are not known. The methods used are intuitive and cannot be regarded as proven. However, they give a qualitative indication of where the solution lies and in many cases have been checked by computer simulation. They should have heuristic value and I hope that they may point the way to rigorous, exact solutions at some later time.
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