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Sex-Differential Selection and the Evolution of X Inactivation Strategies

Figure 4

Sex-differential selection favors the evolution of biased RXI.

Black curves are based on eq. (8) for the mutation-selection balance model of genetic variation; diamonds are based on numerical evaluation of the more exact eq. (7). Gray curves are based on eq. (9) for sexually antagonistic alleles maintained by balancing selection. Results for the mutation-selection balance case assume equal male and female selection coefficients (sm = sf). Biases are further accentuated when sm>sf; biases may be dampened or reversed when sm<sf.

Figure 4