A graphical illustration of how (co)variance in resource acquisition and allocation determine cross-sex genetic correlations between fitness components (modified from Zajitschek & Connallon, 2017). Resources are acquired to determine the total resource pool (R) that an individual has available to allocate to a set of traits, zi-n, that are under selection. The genetic variance in resource acquisition and the correlation between male and female resource acquisition has significant consequences on the expression of genetic (co)variance in downstream traits, including rz mf and, most importantly, sex-specific fitness variance and the cross-sex genetic correlation for fitness rw mf. High values of rR mf can swamp sexually antagonistic selection on allocation to z, creating positive rw mf and masking SA. Alternatively, the evolution of sex differences in optimal resource acquisition could reduce rR mf, dramatically increasing sexual antagonism even if selection on allocation to z is not sexually antagonistic. Thus, the model predicts that the evolution of resource acquisition in males and females plays a central role in generating and resolving sexual conflict.
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