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DNA marker by use of PCR is used for detection of defects in pregnancy.
called as prenatal screening
This is not your first question, yet it is tagged as such.
So what happened to the very thorough, careful and interesting response I posted to your question on gene silencing a few days ago? You remember, the one I specifically asked you NOT to delete once you'd read it. This is uncool and unfair to the people who answer your questions and to everyone else who uses OpenStudy.
In the future, please leave your questions (and other peoples' responses) up. I prefer to ask you to nicely (I hope that's clear to you ;D) but this is a form of abuse and if I see another question posted by you with a "First Question!" tag on it, I will report it.