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These highly reliable blood tests can identify the chromosomal arrangement of the fetus and give a determination of fetal sex, ranging from 95-99 accuracy for boys and girls, respectively. These types of blood tests replaced earlier, more invasive tests, such as amniocentesis or chorionic villus sampling. Prenatal sex determination was banned in india in 1994, under the pre-conception and prenatal diagnostic techniques (prohibition of sex selection) act. The act aims to prevent sex-selective abortion, which, according to the indian ministry of health and family welfare, has its roots in indias long history of strong patriarchal influence in all spheres of life. Sex determination in animals is an integral part of reproduction. In general, sex determination describes the genetic and environmental processes that influence sex differentiation, whereas sex differentiation is the physical realization of these events in terms of testicular or ovarian development (mittwoch, 1996). Most mammals, including humans, have an xy sex-determination system the y chromosome carries factors responsible for triggering male development. In the absence of a y chromosome, the fetus will undergo female development. This is because of the presence of the sex-determining region of the y chromosome, also known as the sry gene. Thus, male mammals typically have an x and a y chromosome (xy), while female mammals typically have two x chromosomes(xx). Manzanares s, bentez a, naveiro-fuentes m, lpez-criado ms, snchez-gila m. Accuracy of fetal sex determination on ultrasound examination in the first trimester of pregnancy. Sex determination, although crucially important for the survival of a species, is arguably the least conserved mechanism in evolution and is instead one of the most variable developmental pathways. There are two main mechanisms of sex determination genetic (gsd) and environmental sex determination (esd).

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