Final answer:
PCR is a technique that amplifies a specific DNA sequence through exponential growth. With each cycle, the number of DNA sequences doubles, leading to the synthesis of the desired product.
Step-by-step explanation:
The polymerase chain reaction (PCR) is a technique used to amplify a specific DNA sequence. With each cycle of PCR, the number of DNA sequences doubles, resulting in an exponential amplification of the desired DNA. This occurs because the primers used in PCR are more likely to anneal to the amplified DNAs than to the original template, leading to the synthesis of the desired product.