Final answer:
Nucleic acid probing is the technique used to identify a specific DNA sequence.
Step-by-step explanation:
The technique used to help identify a specific DNA sequence is nucleic acid probing. Researchers use artificially constructed pieces of DNA called probes to isolate and identify specific stretches of DNA. Probes are complementary to the gene of interest and different from other DNA sequences in the sample, allowing researchers to determine the presence of a certain DNA sequence.