Final answer:
Family studies are the most helpful research technique for examining the genetic basis of obesity.
Step-by-step explanation:
The most helpful research technique for examining the genetic basis of obesity is family studies. These studies reveal the strength of the genetic influence on obesity, showing that when both parents are obese, 80 percent of their offspring will also be obese. In comparison, when both parents are of normal weight, less than 10 percent of their offspring will be obese.
Family studies allow researchers to analyze the prevalence of obesity within families and determine the genetic factors contributing to the condition. By studying the genetic influence on obesity, researchers can gain valuable insights into the genetic basis of obesity and potentially develop strategies for prevention and treatment.