From: Spatial heterogeneity, frequency-dependent selection and polymorphism in host-parasite interactions
 |  | Fitness | |
---|---|---|---|
Host genotypes (frequencies) | Parasite genotypes (frequencies) | Parasite | Host |
RES (R i ) | AVR (A i ) | 1-c i | 1-u i |
 | avr (a i ) | 1-b i | (1-u i )(1-s i ) |
res (r i ) | AVR (A i ) | 1 | 1-s i |
 | avr (a i ) | 1-b i | 1-s i |