Fig 1. Fitness matrix of a symmetrical general case made of two biallelic loci with dominance coefficients (h_A and h_B), selection coefficients (s_A and s_B), and epistasis coefficients (ϵ_aa, ϵ_ad and ϵ_dd).

The combinations of value ranges for these parameters explain our three models of genetic incompatibility. The 2D or 3D fitness landscapes represent unique combinations of parameters.