Heart disease is thought to be a polygenic disorder in humans. knowing this, what would you expect to see if you screened a large number of people for heart disease?

The correct answer is - Those with heart disease should show a continuous range of symptoms, from very mild to very intense.
Polygenic means that it is a type of a disorder which many different genes influence, and thus the disorder has variable properties. These properties would include various types of symptoms, which could be mild, intense, or something else entirely.