What could explain selection favoring the complete allele when fish are still juveniles, ie they lack the final number of plates? Consider the fact that the increase in frequency of the complete allele is offset by a decrease in the heterozygous genotype, and not in the frequency of the low morph homozygous genotype. 8. What are the broader implications of this study? Can we conclude that the Eda low allele is always advantageous in freshwater habitats? Under which conditions would having a complete morph actually be advantageous in freshwater habitats?