preimplantation genetic diagnosis

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are you guys familiar about PGD? it is a process of developing embryo outside a mother's womb for particular genetic characteristics, usually abnormalities that cause serious disease, before being transferred to a woman's uterus. it is also a powerful tool that allows parents to identify and select genetic characteristics of their children. what is your stand in a situation like living in a society where one's genetics becomes a matter of choice than a chance. what restrictions, should the government impose on this use? and same thing with the physicians? what moral considerations should prospective parents regard to their use of PGD?