If someone is predisposed to a disease, they are more likely to contract the disease due to 0

If someone is predisposed to a disease, they are more likely to contract the disease due to Heredity  

Explanation: Heredity is the passing of characteristics from one generation to another ( for example parents pass genes to offspring). Characteristics like eye color, height etc. So if either one of your parents have a disease there may chances that it may be passed onto you. There are chances that it may not happen but that are minimal chances. This is not affected by environmental factors.

answer; more than 80% percent of adults;