Genetic Markers Show the Presence of a Predisposition to a Disease

Genetic markers show the presence of a predisposition to a disease or condition by

A) showing if the person produces the proteins associated with the disease or condition.
B) showing changes in the DNA that will cause the disease or condition.
C) stimulating the DNA to cause the symptoms of the disease or condition.
D) showing the specific number of DNA fragments associated with the disease or condition after cutting by restriction enzymes.
E) causing the affected area on the patient to fluoresce.