Physicians decide our susceptibility or resistance to a particular disease through A. SNPs (Single Nucleotide Polymorphisms). SNPs are variations in a single nucleotide (A, T, C, or G) at a specific position in the genome that occur in at least 1% of the population. SNPs can be used to identify genetic variations that are associated with an increased risk or decreased risk of developing certain diseases. For example, some SNPs have been linked to an increased risk of developing certain types of cancer or cardiovascular diseases. By analyzing a person's genetic profile for specific SNPs, physicians can determine their susceptibility or resistance to a particular disease.