What Do Twin and Adoption Studies Indicate About the Role

Multiple Choice

What do twin and adoption studies indicate about the role of genes in body weight?

A) Genes account for between 50% and 90% of the variation in body weight.
B) Genes account for a moderate 15-20 % of the variation in body weight.
C) Genes only account for 5-10 % of the variation in body weight.
D) Body weight is not influenced by genes.