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Maternal Personality, Evolution and the Sex Ratio spanish conversation business relationships and management cultureWomen who are dominant are more likely to have sons. Demographic studies show that more male children are born after wars, yet most people believe that their baby's sex is a matter of chance determined by the father's sperm. Valerie Grant presents evidence that the mother's personality which is related to female testosterone levels can actually influence which type of sperm fertilises the eggUsing data from human and animal studies Valerie Grant