Stability analysis of a sex-ratio model with autosomal suppression

EquilibriumStability conditions
Suppressor noninvasion (+) Embedded Image
Polymorphism (sup/+) Embedded Image
Suppressor fixation (sup) Embedded Image

The parameters a, b, and c are the fitnesses of ST/SR, SR/SR, and SR/Y individuals, respectively. *Stability of the SR/ST polymorphism; **stability of the SR/ST polymorphism for bc > 1.