Examining chromosomes to find specific genes linked to behavioral conditions has led to which of these conclusions?

a. Most behavioral variations depend on many genes with small effects.
b. Most behavioral variations depend on a single dominant gene

Alcohol-related disorders are

a. on the decline in the United States. b. relatively rare forms of mental disorders. c. among the most common forms of mental disorders in the United States. d. not studied extensively enough to draw firm conclusions.

One challenge of blended families is role ambiguity, which means that

A) there is declining dependence of adolescents on family members. B) increased independence and autonomy are experienced by adolescents. C) roles and expectations are unclear. D) there are disagreements about whether or not adolescents are ready to participate in rites of passage.