In this model, there are an additional two loci: two preference loci, P1 and P2, control female preference, and two trait loci, T1 and T2, control male display traits.
The following criteria were applied for SNP selection: no more than 2 SNPs were selected per locus, with preference being given to SNPs present in at least two lines in the discovery panel.
This suggests that loci controlling preference and acceptance (i.e. performance) may be unlinked, a requirement for some speciation models (Bush 1975; Fry 2003).
The model includes a mate preference locus, a male trait locus undergoing divergent selection in the two populations, and cytoplasmic incompatibility.
Results clearly indicate a major host preference locus (or set of tightly linked loci) in the region around bkbwg.
Ignoring sampling effects, these observations suggest strongly opposing tendencies for the two loci, with homotypic fusion preferences at the 6PGDH locus and heterotypic preferences at the SKDH locus.
Although we have not analyzed intermediate rates of recombination in this study it is worth noting that linkage between trait and preference locus will assist the spread of mutants at the preference locus and, further, increase the frequencies of the preferred male trait.
Evidence of a host preference locus was originally detected during introgression of male-specific wing-size locus ws1 g from N. giraulti into N. vitripennis (Weston et al., 1999).
This structure using differential selection at a trait locus and a preference for that trait is similar to other modeling efforts of mate preference (e.g. [6], [13]).
Each haploid individual in the population is defined by ten preference loci and ten mortality loci.
