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Effective sperm spinning
Flow cytometric sorting can be used to separate sperm based on sex chromosome content. Differential fluorescence emitted by stained X- vs. Y-chromosome-bearing sperm enables sorting and collection of samples enriched in either X- or Y-bearing sperm for use to influence the likelihood that the offspring will be a particular sex. Herein we report the effectiveness of flow cytometric sorting of human sperm and its use in human ART procedures.
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Methods Of Gender Selection - Sperm Sorting - IVF with PGD
The idea was to use only XY sperm to fertilize the embryos, and you would get more male embryos. For reasons that remains a mystery, the FDA ruled against gender selection via sperm sorting. But as you pointed out, PGS is flawed because it can only test embryos and the gender is already determined at that point. So your odds of having a boy or a girl are not really helped by the test.
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Sex selection by means of infanticide is condemned as outrageously immoral by the Western world. But what about sex selection by means of "sperm sorting"? Is this an acceptable option?
Sperm sorting is a gender-selection technique that improves a couple's chances of choosing their embryo's sex. A couple may choose this option to prevent certain genetic diseases or to promote family balancing. Prior to insemination of the egg, sperm sorting separates X-chromosome female sperm from Y-chromosome male sperm, both of which determine the sex of the offspring.