Why is there so much genetic variation for wing dimorphism?

@article{Roff2006WhyIT,
  title={Why is there so much genetic variation for wing dimorphism?},
  author={Derek A. Roff},
  journal={Researches on Population Ecology},
  year={2006},
  volume={36},
  pages={145-150}
}
Wing dimorphism appears in general to be determined either by a single locus, 2 allele system in which brachyptery is dominant, or by the additive action of numerous loci. In the latter case studies indicate that the heritability is typically quite large. It is generally postulated that wing dimorphism is under strong selection: why then is genetic variation not eroded? In this paper I consider three possible explanations. First, genetic variation may not be exposed to selection because… CONTINUE READING
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