Question

Regarding genetics, environment, and depression ______.a. if one of a pair of identical (monozygotic)

twins suffers from depression, the other twin has only a 50/50 chance of also suffering from clinical depression, suggesting that genes don’t play much of a role in depression.

b. the gene that has been most studied for its role in depression is the gene that determines how much dopamine is produced by neurons.

c. not only do typical siblings share about 50% of their genes with each other, they also typically share the same childhood environment, and both of these play an important role in the development of depression.

d. low levels of glucocorticoids in response to stress are thought to be an important instigator of a depressive episode.

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