Abstract
A theory on the evolution of human primary sex ratio is proposed. Effects of parental preference for sons, reflected in birth control based on offspring sex ratio and female biased infanticide, on the evolution of primary sex ratio are analyzed. Both are shown to select for female bias in primary sex ratio. The gene-culture coevolution of female infanticide and primary sex ratio is also studied and it is shown that female infanticide develops more in societies in which the father plays a more important role in the transmission of culture than the mother does.
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