In London, Peppered Moths exhibit two distinct color patterns; light and dark. The darker moth thrives in industrial areas where
the lighter moth is greatly subjected to predators. Likewise, darker moths are visible in rural areas where lighter moths camouflage better with their surroundings. Very rarely will an "average" coloration of this moth exist as it is visible in both environments. Thus, few numbers exist, if any. Which graph illustrates extreme expressions of a trait being favored with its average form being removed? A C B D
Natural selection can cause microevolution (change in allele frequencies), with fitness-increasing alleles becoming more common in the population. ... Natural selection can act on traits determined by alternative alleles of a single gene, or on polygenic traits (traits determined by many genes).
