Which factor is described as genetics influencing optimum weight because body weight and shape are largely passed through genes from parents?

• A. Height
• B. Bone structure
• C. Muscle girth
• D. Genetics

Answer: (D)

Genetics sets the range of a person’s natural body weight and shape because many traits that influence weight—bone size and frame, muscle potential, and how fat is stored—are inherited from parents. These inherited differences mean evidence of weight patterns often appears within families, so the optimum weight for health and performance tends to be shaped by genes passed down generations. While training can alter muscle size and fat levels, the baseline tendency for weight and body shape comes from genetics, making it the most fitting description.