Page "Sex selection" Paragraph 9
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Wikipedia
Prior to fertilization with IVF, the fertilized eggs can be genetically biopsied with preimplantation genetic diagnosis ( PGD ) to increase fertilization success.
Once an embryo grows to a 6-8 cell size, a small laser incision in the egg membrane ( zona pellucida ) allows safe removal of one of the cells.
A Geneticist then studies the chromosomes in the extracted cells for genetic defects and for a definite analysis of the embryo ’ s gender.
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