Suggest a mechanism that would allow a plant to grow better if it had intermorph neighbors than if it had intramorph neighbors. Think about the degree of genetic similarity between the focal plant and its neighbors and make a link between genetic similarity and resource use.
(Extra: Standard morph (YY or Yy) is the green body mustard plant. The yellow-green morph (yy) has Anthocyanin that makes ends purple and also has small hairs called trichomes).