Biology and DNA

What is PGD?
What is a fetal DNA test?
Compare and contrast PGD and fetal DNA tests.
What are the advantages of PGD and fetal DNA tests over established procedures such as amniocentesis and chorionic villus sampling (CVS)?
What are the current concerns/issues with fetal DNA tests?
What ethical issues concerns might arise as PGD and fetal DNA test technologies become more and more sophisticated?

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