The conclusion of the Russian study of the interaction between genotype and environment suggested that boys exposed to maternal rejection who also carried a specific variation of the DAT1 gene were more likely to be depressed after their experience. The conclusion the textbook draws from this research is that
a. a variant of the DAT1 gene is the cause of depression.
b. depression is a genetic disorder.
c. maternal rejection is one of the causes of depression.
d. prolonged exposure to dopamine may lead to depression.
Question 2
Research has shown that people who are socially isolated are vulnerable to a host of cardiovascular and infectious diseases due to increased levels of the stress hormone cortisol. A recent study, summarized in the textbook, provides evidence that this is effected by differences in
a. the genomes of individuals who are high in cortisol levels.
b. diet that encourages the production of cortisol.
c. gene expression.
d. Mendelian inheritance.
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