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Polymerase Chain Reaction (PCR) Analysis PCR analysis is a technique that allows technicians to create millions of precise DNA replications from a single sample of DNA. In fact, DNA amplification alongside PCR can let forensic scientists perform DNA analysis on samples that are as tiny as only a couple of skin cells. In contrast to some other DNA analysis techniques, PCR analysis has the advantage of analysing minuscule sample sizes, even if they are degraded although they must not be contaminated with DNA from other sources during the collection, storage and transport of the sample.

Professor Julian Savulescu said that creating so-called designer babies could be considered a "moral obligation" as it makes them grow up into "ethically better children". The expert in practical ethics said that we should actively give parents the choice to screen out personality flaws in their children as it meant they were then less likely to "harm themselves and others". The academic, who is also editor-in-chief of the Journal of Medical Ethics, made his comments in an article in the latest edition of Reader's Digest. He explained that we are now in the middle of a genetic revolution and that although screening, for all but a few conditions, remained illegal it should be welcomed.