Answer:
allele-specific oligonucleotides (ASOs)
Step-by-step explanation:
An allele-specific oligonucleotide (ASO) is a piece of synthetic DNA that is short and usually a complementary to the sequence of a target DNA, It is an oligonucleotide of 15–21 nucleotide bases in length.
It acts as a probe in southern blot assay or simpler Dot blot assay to identify the presence of a target.
It is an important research tool in genetic testing, forensics, and Molecular Biology.
The probes can detect a difference of as little as 1 base in the sequence targeted.