Final answer:
Henrietta's flock of backyard chickens produced more eggs than her neighborhood due to stabilizing selection.
Step-by-step explanation:
Henrietta's flock of backyard chickens produced more eggs than her neighborhood. This can be explained by the concept of stabilizing selection in biological populations. Stabilizing selection is a type of natural selection that favors intermediate phenotypes, in this case, producing a moderate number of eggs. Larger clutches may result in malnourished chicks, while smaller clutches may result in no viable offspring. Therefore, Henrietta's flock producing more eggs suggests that her chickens are experiencing favorable conditions for reproduction.