question: Q:A genetic counselor sees a family for the first time for genetic assessment. The 24-year-old businessman and his 19-year-old sister are concerned about having a mutant allele and have decided to get tested. Their grandfather and great aunt both have Huntington’s disease which became apparent when they turned 52. Their father who is 47 years old appears healthy. The geneticist discusses both the benefits and risks of getting tested and orders some tests. Which of the following tests would best provide evidence for whether the siblings are carriers or not?? 
  {'A': 'Polymerase chain reaction', 'B': 'Restriction enzyme digestion products', 'C': 'Gel electrophoresis', 'D': 'Pyrosequencing', 'E': 'DNA isolation and purification'},