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Theoretical allele trajectories under directional selection for a dominant, additive, and recessive advantageous allele. The fitness (W) of the different genotypes (W 11, W 12, W 22) is defined as W 11 = W 12 > W 22 for a dominant, W 11 > W 12 > W 22 for an additive, and W 11 > W 12 = W 22 for a recessive advantageous allele (allele trajectories were simulated using custom R code; R Core Team 2019).
