Family Balancing/Sex Selection
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PGD can also be used for the purpose of family balancing or sex selection, by testing for the chromosome content of an embryo. Male embryos will have an X and Y chromosome, while female embryos will have two X chromosomes. This technology is also used to screen for additional chromosome abnormalities linked specifically to the sex chromosomes (like Fragile X), to increase the chances of having a successful pregnancy and healthy baby.