Correct Answer: A

Rationale: When a family member, especially a parent, suffers from serious depressive episodes, it can increase the risk of depression in other family members, including children. Therefore, in this situation, Dana is likely to be at risk for depression herself. Choice B is incorrect because experiencing a parent's depression does not necessarily lead to becoming a happy-go-lucky child; it can have serious emotional implications. Choice C is incorrect as there is no direct link between a parent's depression and a child acting in an aggressive, criminal manner. Choice D may seem plausible, but it is not the most likely outcome in this scenario.

Correct Answer: A

Rationale: The correct answer is A. Studying specific gene defects is not a common method for investigating genetic influences. Choices B, C, and D are common methods used in genetic research. Twin studies help determine the heritability of traits, adoption studies compare similarities between adopted individuals and their adoptive families versus biological families, and family history studies track the inheritance patterns of traits within families.

Correct Answer: B

Rationale: The diathesis-stress model proposes that mental disorders develop from a combination of genetic vulnerability (the diathesis) and environmental stressors. Choice A is incorrect because it states that stress alone can cause mental disorders, which is not in line with the model. Choice C is incorrect as it simplifies the model to genetic factors alone causing mental disorders. Choice D is incorrect as it suggests that environmental stressors do not play a role in the onset of mental disorders, which contradicts the essence of the diathesis-stress model.

Correct Answer: B

Rationale: The correct answer is B: 'necessary cause.' A necessary cause must be present for a disorder to occur. In the context of developing chicken pox, being exposed to the virus is a necessary condition for contracting the disease. Choices A, C, and D are incorrect. A 'risk factor' increases the probability of developing a disease but is not essential for its occurrence. A 'sufficient cause' can produce the outcome on its own, which is not the case with exposure to the chicken pox virus. A 'contributory cause' adds to other causes to produce an effect, but in this scenario, exposure to the virus is crucial by itself.

Correct Answer: B

Rationale: A psychologist who studies the relationship between sociocultural factors and mental disorders would focus on factors like poverty and racial discrimination. These factors have a significant impact on mental health outcomes within different populations. Choices A, C, and D are less directly related to sociocultural factors like poverty and racial discrimination and their influence on mental disorders, making them incorrect.