Can u explain how pcr can detect very. Low amounts of. Dna

The PCR helps to detect the low amount of DNA by amplifying that piece of DNA to form many copies. The amplified DNA can be then easily detected by using other testing procedures. This technique is used to detect infection at the early stage by amplifying the DNA of microbe.

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actually through polymerase chain reaction (pcr), a small strand of dna is taken and it is amplified multiple times ( i.e into 1000x times)
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What are you looking for?