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x dimension of population genotypes and therefore spatial clumping of allele frequencies. There is no such spatial structure in the population with random mating (a). In the simulation that produced these pictures, the grid is initially populated at random with genotypes at Hardy-Weinberg expected frequencies and p = q = V2. Each generation every individual chooses a mate at random within its mating neighborhood and replaces itself with one offspring. The offspring genotypes are determined by Hardy-Weinberg probabilities for each combination of parental genotypes.

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