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Sex differences in the human brain are of interest for many reasons: for example, there are sex differences in the observed prevalence of psychiatric disorders and in some psychological traits that brain differences might help to explain. We report the largest single-sample study of structural and functional sex differences in the human brain female, male participants; mean age Males had higher raw volumes, raw surface areas, and white matter fractional anisotropy; females had higher raw cortical thickness and higher white matter tract complexity. There was considerable distributional overlap between the sexes. Subregional differences were not fully attributable to differences in total volume, total surface area, mean cortical thickness, or height. There was generally greater male variance across the raw structural measures.
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Sex Determination in Honeybees

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Sex and gender issues in multiple sclerosis

This page has been archived and is no longer updated. In honeybees or honey bees , sex is normally determined by the fertilization or non-fertilization of eggs, rather than the presence or absence of sex chromosomes. This mode of sex determination was first discovered by Johann Dzierzon, a Catholic priest, in Dzierzon reported that a virgin queen which has not taken a mating flight the queens mate only while in free flight away from nest produces only male progeny Dzierzon et al. His report was the first rigorous description of a sex determination system, occurring more than 50 years before the discovery of sex chromosomes McClung, ; Wilson, In haplodiploid systems, male progeny normally develops from unfertilized eggs, which are haploid and have just one set of chromosomes.
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Sex and gender issues in multiple sclerosis

Multiple sclerosis MS is universally found to be more prevalent in women than men. This has led to extensive studies of differences in the immune system or nervous system between women and men, which might be caused by the effects of gonadal hormones, genetic differences, and different environmental exposures and modern lifestyle in men and women. We review the effects of sex and gender from a genetic, immunological and clinical point of view. We discuss the effects of sex on the clinical expression of MS and responses to therapy, as well as issues concerning pregnancy.
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Both countries had long maintained isolationist tendencies, with limited commerce with the West. China welcomed foreign trade, but western merchants had no privileges there and were confined to Canton, where they could only deal with the Co-hong, a group of traders (Edwardes, 1973). Japan was even stricter, allowing commerce only with the Dutch, who had access to only one port, Dejima (Rosenberg, 1978).
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