In the 1980s,when researchers began seeking gene variants that can cause or contribute to bipolar disorder,it seemed that each extended family had its own mutations.These findings,looking back,most likely mean that
A) the families have different allele combinations of the same gene.
B) bipolar disorder results from imitating the behavior of an affected family member.
C) Many gene variant combinations cause or contribute to bipolar disorder, but only a few such variants are seen in any one family.
D) many people fake the symptoms of bipolar disorder.
E) bipolar disorder reflects changes in gene expression, but not in mutations.

Question

Quizplus · Accepted Answer

The finding that each extended family had its own mutations suggests that many gene variant combinations cause or contribute to bipolar disorder, but only a few such variants are seen in any one family. This indicates that bipolar disorder is likely caused by multiple genetic factors, rather than a single gene or mutation, and that each individual may have a unique combination of genetic risk factors contributing to the disorder.

In the 1980s,when Researchers Began Seeking Gene Variants That Can