How Could PCR Be Used for the Detection of a SNP

Multiple Choice

How could PCR be used for the detection of a SNP?

A) PCR coupled with Southern blotting using one of the primers as a probe.
B) The PCR reaction would need to be sequenced.
C) The PCR reaction could be subjected to agarose gel electrophoresis to determine the presence and size of the fragment.
D) If a fragment is amplified then the SNP is present, no other techniques would have to be used