Describe the relationship between genetic testing and the polymerase chain reaction. How has the PCR technique made genetic testing possible on a large scale?

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Genetic testing is a type of medical test that identifies changes in chromosomes, genes, or proteins. (PCR) is a technique used to take a piece of DNA and make many copies of it. they can enlarge the genes to a size measurable to eye to get a closer glimpse of the gentics or dna strands.