THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The SI gene provides instructions for producing the enzyme sucrase-isomaltase. This enzyme is found in the small intestine and is responsible for breaking down sucrose and maltose into their simple sugar components. These simple sugars are then absorbed by the small intestine.

Detailed explanation-2: -During digestion, an intestinal enzyme (invertase) hydrolyses sucrose, breaking down this disaccharide into two monosaccharides, fructose and glucose. Thus, our digestive system turns sucrose into inverted sugar in order to be able to absorb it.