While conducting a family study, a researcher determines that the siblings and parents of the person with a disorder are much more likely than the general public to have the disorder, although cousins, uncles, and grandparents are only moderately more likely to have the disorder than the general public. This is an example of a disorder with
A) no genetic component.
B) a single gene influence.
C) a genetic component.
D) strong environmental and very weak genetic components.

Question

Quizplus · Accepted Answer

The fact that siblings and parents are much more likely to have the disorder than the general public indicates that genetic factors contribute to the disorder. However, the moderate increase in risk for more distant relatives suggests that environmental factors also play a role, but to a lesser extent. Therefore, this is an example of a disorder with a genetic component.

While Conducting a Family Study, a Researcher Determines That the Siblings