Threshold Model of Reversal

Topic

The threshold model of reversal (specifically referring to sex-specific dominance reversal in threshold traits) is an evolutionary genetics framework used to explain how the dominance of alleles can reverse between sexes. Under this model, a continuous underlying liability trait determines a binary or categorical phenotypic outcome once a critical threshold is crossed. This mechanism allows for the intrinsic emergence of sex-specific dominance reversals, which can help maintain genetic variation under sexually antagonistic selection.