Why might a person whose ancestors came from the Arctic tend to carry more body fat than a person whose ancestors came from the tropics despite similar diets and exercise?

This is likely due to evolutionary adaptation. People whose ancestors came from the Arctic regions may have evolved to store more body fat as a way to survive in the cold climate. This extra body fat would have provided insulation and energy reserves to help them survive the cold temperatures and limited food sources. On the other hand, people whose ancestors came from the tropics may have evolved to carry less body fat as a way to survive in the hot climate. This would have allowed them to stay cooler and conserve energy.