Four microsatellite loci used by FBI in Catalonia were exami

Four microsatellite loci used by FBI in Catalonia were examined. They found 8 alleles for loci 1, 10 alleles for loci 2, 13 alleles for loci 3, and 11 alleles for loci 4. If a catalonian man matched DNA taken from crime scene, what is the probabilty he was never at the crime scene?

Solution

Four microsatellite loci used by FBI in Catalonia were examined. They found 8 alleles for loci 1, 10 alleles for loci 2, 13 alleles for loci 3, and 11 alleles for loci 4. If a catalonian man matched DNA taken from crime scene, then the  probabilty he was never at the crime scene will be half half or we can say 50-50. Because normally the procedures are based on PCR based to match the standards and now also forensic scientists are resolving cases that suspect is present or absent on the crime scene by usage of short tandem repeats.