Selection against deleterious alleles and the subsequent decrease in their frequency is called __. Adaptive evolution Evolutionary fitness Relative fitness Natural Selection There is a pond with a mud of verifying colors lining it. There is a population of bottom-dwelling tadpoles that have a variety of body colors. There are fist that visually hunt the tadpoles. There is a sudden influx of red mud into the pond. What is most likely to have a major impact on the alleles of the tadpoles? Drift due to a population bottleneck. Natural selection from predation by fish. Gene flow from new tadpoles in the mud. Natural selection from environmental charge.