Final answer:
The ladybug scenario is an example of disruptive selection, favoring extreme variations of pigmentation over moderate ones, in contrast to the directional selection seen in the peppered moth case due to the Industrial Revolution.
Step-by-step explanation:
The scenario described where a number of ladybugs dispersing from their native population site and colonizing a new environment with a selective disadvantage placed on moderately red individuals represents disruptive selection. This type of natural selection favors extreme variations over the average or moderate phenotype. This can be compared to the classic example of the peppered moth, which underwent directional selection due to environmental changes brought by the Industrial Revolution, resulting in a population shift towards darkly pigmented moths better suited to the soot-covered environment. On the contrary, in stabilizing selection, the population's genetic variance decreases as average phenotypes are favored, which is not the case in the ladybug scenario. Genetic drift, on the other hand, involves random changes in allele frequencies and is not a selective process.