In humans, birthweight can be represented by a typical bell curve. Babies of low weight lose heat more quickly (surface to volume ratio) and get ill from the infectious disease more easily, whereas babies of large body weight are more difficult to deliver through the pelvis. Which type of selection would most likely occur?

This question is incomplete

Explanation:

The question is incomplete because the example referred to was not stated. However, phosphofructokinase-1 is a key enzyme in glycolysis; it converts/phosphorylates fructose-6-phosphate to fructose-1,6-bisphosphate in the presence of ATP to release ADP. It is a regulatory enzyme in this pathway (glycolysis) because it's function can be affected by an increased ATP to ADP ratio which inhibits the enzyme (phosphofructokinase-1) and indeed glycosis itself.