In one study, more than 300 sons were produced for every daughter queen. Alter another assumption. Suppose it is not the mother that controls sex ratio With maternal control, we were able to ignore relatedness. A mother is equally related to her sons and daughters, so she neither transmits any more of her genes for that reason. But if she were more related to one sex, that would cause selection to rear more of that sex.
Workers do all the brood care and feeding.
If what matters is the relative investment in males versus females, one might expect the workers to control this. But social ants, bees, and wasps, are haplodiploid, and that has some strange consequences for relatedness Consider a species where each colony is headed by a single queen, who previously mated a single male. In diploids, the workers are equally related to sisters and brothers. Vary yet another assumption, that of random mating. This means if only one female laid her eggs in that place, her sons will mate only with her daughters.