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10-Mar-2016 08:00 by 2 Comments

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In countries such as India, China and Nepal sons have been favored over daughters.

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The method has a 70-72% success rate for boys and a 69-75% success rate for girls.

The factors are: (1) A preference for sons which stems from household structures “in which girls and women have a marginal social, economic and symbolic position, and consequently enjoy fewer rights.” These household structures also focus on security in which sons are expected to provide support to their parents throughout their life; (2) Technological growth of prenatal diagnosis which allows parents to know the sex of their unborn child; and (3) Low fertility which increases the need for sex selection by reducing the probability of having a daughter in smaller families.

The United Nations Population Fund states that “Local fertility restrictions and spontaneous rapid fertility decline below replacement levels tend to compel parents who want both a son and a small family size to resort to sex selection.” In many cultures, male offspring are desired in order to inherit property, carry on the family name and to provide support for parents in old age.

As the spermatozoa pass through the flow cytometer in single file, each spermatozoon is encased by a single droplet of fluid and assigned an electric charge corresponding to its chromosome status (e.g. The stream of X- and Y- droplets is then separated by means of electrostatic deflection and collected into separate collection tubes for subsequent processing.

Sex selection after implantation can be performed by prenatal sex discernment, followed by sex-selective abortion of any offspring of the unwanted sex.

The results were similar to a survey in 1941, when Americans preferred a boy to a girl by a 38% to 24% margin.

The overall preference was driven by men, of whom 49% preferred a son compared to 22% who preferred a daughter.Since only embryos of the desired sex are transferred to the mother, IVF/PGD avoids the small likelihood present in the Ericsson method of an undesired sperm fertilizing the egg.Gender selection success rates for IVF/PGD are very high.This tiny difference creates separate layers of concentrated male and female sperm.The layers of gender-selected sperm are of higher concentrations but not pure.Prior to flow cytometric sorting, semen is labeled with a fluorescent dye called Hoechst 33342 which binds to the DNA of each spermatozoon. has more DNA) than the Y chromosome, the "female" (X-chromosome bearing) spermatozoa will absorb a greater amount of dye than its male (Y-chromosome bearing) counterpart.