Figure 1From: Adaptation of gastrointestinal nematode parasites to host genotype: single locus simulation modelsChanges in the frequency of the alternate B allele in worms when the initial frequency of B is either (i) 0.001, (ii) 0.01, (iii) 0.1 or (iv) 0. Under Scenario 1, there is a 20% survival advantage (s h ) for the B allele in sheep carrying the A allele and no mortality trade-off on pasture (s p = 0).Back to article page