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THE intrauterine position relative to members of the same or opposite sex that a rodent fetus occupies affects both its morphology and behaviour when adult1-14. Female fetuses that mature between males are androgenized by testosterone crossing fetal membranes15,16, and their phenotypes as adults differ significantly from those of sisters that received less intrauterine exposure to exogenous testosterone17-20. We report here that adult female Mongolian gerbils that gestated between male fetuses produce litters containing a significantly greater proportion of sons than the litters produced by those that gestated between female fetuses. Consequently, daughters delivered by dams that gestated between male fetuses are more likely to have gestated between male fetuses and be androgenized in utero than are daughters of dams that gestated between female fetuses. Female gerbils thus tend to inherit the phenotype (either androgenized or not androgenized) of their respective mothers

Adult female mice. --- Adult. --- Androgen. --- Behaviour. --- Contiguity. --- Exposure. --- Female mongolian gerbils. --- Female. --- Fetuses. --- Gerbil. --- Gerbils. --- Intrauterine position. --- Male. --- Males. --- Mongolian gerbil. --- Mongolian gerbils. --- Mongolian-gerbil. --- Morphology. --- Mother. --- Position. --- Rats. --- Rodent. --- Sex. --- Sexes. --- Sexual-behavior. --- Testosterone. --- Time. --- Uterine position. --- Uterus.