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A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most organisms that create their offspring using sexual reproduction have two sexes. Occasionally, there are hermaphrodites in place of one or both sexes. There are also some species that are only one sex due to parthenogenesis, the act of a female reproducing without. The xy sex-determination system is the sex-determination system found in humans, most other mammals, some insects (), some snakes, some fish (), and some plants (ginkgo tree). In this system, the sex of an individual is determined by a pair of sex chromosomes. Females typically have two of the same kind of sex chromosome (xx), and are called the homogametic sex. Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. Sexual differentiation includes development of different genitalia and the internal genital tracts and body hair plays a role in gender identification. Sex selection is the attempt to control the sex of the offspring to achieve a desired sex. It can be accomplished in several ways, both pre- and post-implantation of an embryo, as well as at childbirth. According to the united nations population fund, the reasons behind sex selection are due to three factors and provide an understanding. Xy sex determination is used by most mammals, but also some insects, and plants (silene latifolia). If the baby gets two x chromosomes, it will develop into a female. If the baby gets one x and one y, it will develop into a male. Before babies are born, their sex parts are already formed, but not ready yet.   our chinese gender predictor tries to determine your babys sex based on an ancient chinese gender chart and the chinese lunar calendar, using your age and when you got pregnant. Legend says the chart is more than 700 years old and was discovered in a royal tomb. Human sex is determined at fertilization when the genetic sex of the zygote has been initialized by a sperm cell containing either an x or y chromosome. If this sperm cell contains an x chromosome, it will coincide with the x chromosome of the ovum and a girl will develop. A sperm cell carrying a y chromosome results in an xy combination, and a boy will develop.

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