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Sexually Antagonistic Selection in Human Male Homosexuality

Figure 2

Predictions of model (4b) involving two X-linked loci with sexually antagonistic selection, for u = 1.

(A) Output (i): equilibrium proportion η of GFMH-carrying males as a function of γ, for varying values of α (red plot: α = 1.2; green plot: α = 1.8; blue plots: 1.2<α<1.8). (B) Output (ii): pedigree asymmetries in male sexual orientation, as functions of γ (for α = 1.4). Ratio between the predicted proportions of male homosexuals in the matriline vs. the patriline of homosexuals (red-dashed plot), and the same for heterosexuals (blue-dashed plot); ratio between the predicted proportions of male homosexuals in the matriline of homosexuals vs. the matriline of heterosexuals (red-dotted plot), and the same for the patriline (blue-dotted plot). (C) Outputs (iii)–(iv): pedigree asymmetries in female fecundity, as functions of γ, for α = 1.4. Fecundity ratio of homosexuals' mothers to heterosexuals' mothers (green plot); fecundity ratio of maternal vs. paternal aunts of homosexuals (red-dashed plot), and the same for heterosexuals (blue-dashed plot); fecundity ratio between maternal aunts of homosexuals vs. maternal aunts of heterosexuals (red-dotted plot); the same for the paternal aunts (blue-dotted plot).

Figure 2

doi: https://doi.org/10.1371/journal.pone.0002282.g002