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Women 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 egg.Using data from human and animal studies Valerie Grant discusses the implications for human evolution, developmental psychology and reproductive biology. Her claims are controversial and the imp
Sex determination, Genetic. --- Sex ratio. --- Dominance (Psychology) --- Pregnancy --- Human evolution. --- Testosterone. --- Mothers --- Androgens --- Evolution (Biology) --- Physical anthropology --- Evolutionary psychology --- Human beings --- Pregnant women --- Social hierarchy (Psychology) --- Control (Psychology) --- Social groups --- Ratio, Sex --- Ratios, Sex --- Sex ratios --- Sex (Biology) --- Chromosomal sex determination --- Determination of sex, Genetic --- Genetic determination of sex --- Genotypic sex determination --- Sex --- Sex determination, Genetic --- Gene expression --- Sex chromosomes --- Sex determination --- Psychological aspects. --- Psychology. --- Origin --- Psychology --- Cause and determination --- Human evolution --- Sex ratio --- Testosterone --- Psychological aspects --- Dominance (Psychology). --- Genetic sex determination
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We housed male Mongolian gerbils, their mates, and foster litters of standardized size and sex ratio in enclosures that provided cover in two locations. Males had been gestated in known intrauterine positions. either between two females (2F males) or between two males (2M males). From Days I to 20 postpartum, we examined the frequency with which both males and females were in contact with the pups they were rearing. We Sound that 2F males spent more time with pups than did 2M males both during entire observation periods and when females were away from the nest. Further, when pups were moved from the nest site, 2M males spent more time than did 2F males in the vacated nest site. We concluded that 2F male gerbils spent more time with pups than 2M males not because of a greater attachment of 2F than 2M males to places of concealment, their male, oi their nest site. Rather, 2F males were more attracted to pups than were 2M males. (C) 1998 John Wiley & Sons, Inc
Attachment. --- Care. --- Contact. --- Female. --- Females. --- Frequency. --- Gerbil. --- Gerbils. --- Intrauterine position. --- Intrauterine positions. --- Male mongolian gerbils. --- Male. --- Males. --- Mongolian gerbil. --- Mongolian gerbils. --- Mongolian-gerbil. --- Nest-site attachment. --- Nest. --- Observation. --- Parental behavior. --- Periods. --- Position. --- Positions. --- Pups. --- Rearing. --- Sex ratio. --- Sex. --- Sexes. --- Size. --- Sound. --- System. --- Time. --- Uterine position.
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