Texas A&M University (TAMU) NUTR 320 Understanding Obesity - A Social and Scientific Challenge Exam 1 Practice

The main idea here is that inherited obesity is often due to many genetic variants acting together rather than a single gene doing all the work. When obesity is polygenic, each gene contributes a small amount to risk, and environmental factors can amplify or mitigate that risk. Because of this collective effect from numerous genes, a sizable portion of hereditary obesity is explained by these multiple-gene influences—around sixty percent in some assessments—hence the reference to mutations in several genes including UCP2. This reflects how energy balance and appetite regulation can be shaped by a network of genes rather than a single defect.

The other statements don’t fit this pattern. Obesity is not caused solely by environmental factors, since genetics play a clear role. It’s not typically due to a single gene mutation, which characterizes monogenic obesity. And polygenic obesity can involve genes that influence appetite control and energy expenditure.