Which of the following statements about biological theories of bipolar disorder is true?

A) Research has determined the specific genes that are implicated in both bipolar disorder and schizophrenia.
B) Ongoing research seeks to identify the genes implicated in bipolar disorder, some of which likely contribute to other disorders like schizophrenia.
C) Research has determined that environmental factors rather than genetic dispositions cause bipolar disorder and schizophrenia.
D) Ongoing research seeks to prove that depression and schizophrenia are two forms of the same disorder.

Biological theories of bipolar disorder suggest that genetics play a role in predisposing individuals to the disorder. Ongoing research aims to identify specific genes implicated in bipolar disorder, some of which may also contribute to other disorders like schizophrenia. However, there is no strong evidence to suggest that the same genes are implicated in both disorders. Environmental factors may also play a role in the development of bipolar disorder, but genetics likely also play a significant role. There is no current research aiming to prove that depression and schizophrenia are two forms of the same disorder.