Recent Research Using Genetic Linkage Studies Has Looked for Possible

Recent research using genetic linkage studies has looked for possible patterns of inheritance of bipolar disorders. The results suggest that:

A) there does not appear to be a genetic component in the development of bipolar disorders.
B) there may be several different genes that establish a predisposition to develop bipolar disorders.
C) the close relatives of people with bipolar disorders have an 80 percent chance of having one of these disorders.
D) careful studies in other countries suggest that environmental factors are of far greater importance than genetic factors in the development of bipolar disorders.