Step 1: Define PCR.
PCR (Polymerase Chain Reaction) is a method used to amplify DNA sequences, making it easier to analyze.
Step 2: Identify the correct term.
- Polymerase chain reaction: Correct term for the DNA amplification process.
- Polymerase chain reproduction: Incorrect term.
- Polymerase chain recombinant: Not the correct term.
Step 3: Conclude.
The correct answer is Polymerase chain reaction.
Final Answer:
\[
\boxed{\text{Polymerase chain reaction}}
\]