Question

Prior to C-section surgeries,(a) what outcome would best describe the natural section forces acting on the size of human head?

A) Disruptive selection,
B) Directional selection,
C) Stabilizing selection,
D) Purifying selection,
E) Neutral selection,
F) Genetic drift selection,
G) Fathead selection.

Answer 1

The natural selection forces acting on the size of the human head before C-sections were an example of stabilizing selection, favoring an average head size to fit through the birth canal.

Step-by-step explanation:

Prior to the advent of C-section surgeries, the natural selection forces acting on the size of the human head can best be described as stabilizing selection. This is because, during the process of childbirth, there was a selective pressure to optimize the size of the infant's head to fit through the birth canal. Extremely large heads could lead to difficulties during birth, affecting both the survival of the mother and the baby, while very small heads could be indicative of underdevelopment. Hence, the outcome was typically a relatively narrow range of head sizes that were most likely to survive and reproduce, thus stabilizing the trait in the population.