Organisms of many species are specialized into male and female varieties, each known as a sex. The gametes produced by an organism define its sex: males produce small gametes e. Individual organisms which produce both male and female gametes are termed hermaphroditic. Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience. For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes. Among humans and other mammals , males typically carry an X and a Y chromosome XY , whereas females typically carry two X chromosomes XX , which are a part of the XY sex-determination system.
Indonesia provides particularly interesting examples of gender diversity. Same-sex relations, transvestism and cross-gender behaviour have long been noted amongst a wide range of Indonesian peoples. Based on extensive ethnographic research, it discusses in particular calalai — female-born individuals who identify as neither woman nor man; calabai — male-born individuals who also identify as neither man nor woman; and bissu — an order of shamans who embody female and male elements. The book examines the lives and roles of these variously gendered subjectivities in everyday life, including in low-status and high-status ritual such as wedding ceremonies, fashion parades, cultural festivals, Islamic recitations and shamanistic rituals.
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