Research on sex differences in jealousy has been controversial with contrasting results. Many have examined how factors such as relationship experience may play a role in men’s and women’s jealousy, yet most has investigated sexual and emotional jealousy. Past authors suggest that investigating jealousy as a multidimensional construct, i.e., cognitive, emotional, and behavioral forms, may provi...

This study, which is based on two cross sectional surveys' data, aims to establish any effect of parental obesity sex distribution of offspring and to replicate the results that led to the hypothesis that obesity may be associated with sex-linked recessive lethal gene. A representative sample of 4,064 couples living in Renfrew/Paisley, Scotland was surveyed 1972-1976. A total of 2,338 offspring...

Since the introduction of the one-child policy in China in 1979, many more boys than girls have been born, foreshadowing a sizable bride shortage. What do young men unable to find wives do? This paper focuses on criminality, an asocial activity that has seen a marked rise since the mid1990s. Exploiting province-year level variation, we find an elasticity of crime with respect to the sex ratio o...

Haplodiploid sex determination allows unmated females to produce sons. Consequently, a scarcity of males may lead to a significant proportion of females remaining unmated, which may in turn give rise to a surfeit of males in the following generation. Stable oscillation of the sex ratio has been predicted by classic models, and it remains a puzzle as to why this is not observed in natural popula...

AIMS To determine whether men and women suffering cardiopulmonary arrest differ in terms of survival and risk factors for survival. METHODS AND RESULTS A prospective cohort study, using the Heartstart (Scotland) database, was undertaken on all 22 161 people suffering community-based cardiopulmonary arrest in Scotland between 1988 and 1997. The outcomes studied were death at the arrest scene, ...

We assessed sex differences in the effects of physical attractiveness and earning potentiai on mate selection, and sex differences in preferences and motivations with regard to short-term and long-term mating. We also investigated the effect of a variable likely to produce intra-sex variations in the selection of mating tactics, self-perceived mating success. Forty-eight university students wer...

We describe the analogy between the theory of natural selection on sex ratio in newborn gonochores (which will not change sex), and on the age of sex change in sequential hermaphrodites (which are all born into one sex and change to the other later on). We also discuss the conditions under which natural selection favors sequential hermaphrodites over gonochores and vice versa. We show that, in ...

The present paper reviews the findings of 30 years of verbal/manual dual task studies, the method most commonly used to assess lateralization of speech production in non-clinical samples. Meta-analysis of 64 results revealed that both the type of manual task used and the nature of practice that is given influence the size of the laterality effect. A meta-analysis of 36 results examining the eff...

Sex ratio theory predicts that, if prevailing ecological or social circumstances differentially influence the fitness benefits of offspring of each sex, parents should adjust their production accordingly to maximize fitness. For species in which sex is chromosomally determined, such as birds and mammals, a differential effect of maternal condition on the fitness of male and female young is one ...

Age and sex differences of carbon clearance from the peripheral blood of the rat were investigated. The clearance of carbon was more rapid in the young rats than in the old. Sex difference was significant in the rats of 10 and 14 weeks old, but not significant in the rats of 3 weeks old. Liver blood flow, extraction rate of carbon by the liver and whole circulating blood volume may be the facto...