The salivary amylase gene (AMY1) is present in two diploid copies in chimpanzees. Humans are known to have between 6-15 copies, an adaptation that is thought to be related to the high-starch diet of humans. This difference among humans is an example of:.

Evolution and Natural Selection

Explanation:

Salivary amylase gene (AMY1) copy number is correlated positively with salivary amylase protein levels, and that individuals from populations with high-starch diets have on average more AMY1 copies than those with traditionally low-starch diets. Higher AMY1 copy numbers and protein levels likely improve the digestion of starchy foods, and may buffer against the fitness-reducing effects of intestinal disease.

Chimpanzees did not feed much on starchy food and thus had only diploid copies of AMY1 gene. However, humans have 6-15 copies of AMY1 gene because of high consumption of starchy food. Therefore, as the evolution of chimpanzees occured, humans adapted itself to what changes in their habitat.

the peripheral nervous system or pns contains the nerves, which leave the brain and the spinal cord and travel to certain areas of the body. the peripheral nervous system's main job is to send information gathered by the body's sensory receptors to the cns as quickly as possible.