Research on the genetic and environmental influences on body weight has revealed that

Question

Quizplus · Accepted Answer

Studies on adopted individuals have consistently shown that biological factors play a larger role in determining body weight than environmental factors, as adopted people tend to have similar body weights to their biological parents, even if they were raised in different environments.

Answer: C
 Studies have shown that obesity rates have increased significantly in the United States over the past 50 years, making obesity more common now than in the past.

Answers B and D are incorrect.

Answer B is incorrect because identical twins share 100% of their genetic material, while fraternal twins share only 50%, so it is more likely that identical twins would have a higher correlation in body weight regardless of whether they were raised together or apart.
Answer D is incorrect because there is no evidence to suggest that identical twin men are more similar in body weight than identical twin women.

Research on the Genetic and Environmental Influences on Body Weight