GF-S Balance - Simulation
Adjust m1, m2, s1, and s2 to the right:
As m is increased, the rate of migration from one population to the other is increased. As s is increased, selection against migrants and hybrids is greatest. If both m values are set to the maximum value (while s is set at 0), both populations quickly become more similar until they are indistinguishable. If, however, selection against the migrants is increased, the populations maintain some degree of genetic differentiation, especially when the rates of migration are low.
Note: Pink individuals are hybrids (heterozygotes), green individuals are homozygous for the allele that originated in the upper population, and red individuals are homozygous for the allele that originated in the lower population. The selection coefficient for green individuals in the lower population is s2, the selection coefficient for red individuals in the upper population is s1, and the selection coefficients for the hybrids are 1/2 that of the migrants for each population.