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x dimension of population

Figure 4.3 Isolation by distance causes spatial structuring of allele and genotype frequencies. In these pictures, a population is represented in two dimensions with each point on a grid representing one diploid individual. The colors represent an individual with a heterozygous (blue) or homozygous (black and white) genotype at each point. In (a) there is random mating over the entire population (the mating neighborhood is 99 x 99 squares) whereas in (b) there is strong isolation by distance (the mating neighborhood is 3 x 3 squares). The population with isolation by distance (b) develops and maintains spatial clumping of

2o lo lo 2o so

Generation = 200

40 S0 60

x dimension of population

7o 8o 9o loo

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