At the molecular level genes control the formation of proteins. Different forms of a protein can be produced from a gene depending on the alleles present at that gene. Discuss how dominant, additive, and overdominant gene actions that we see for some characteristics in a plant can be determined by these proteins. 2.When breeders make selections they do so based on the phenotypes of plants they are comparing. Write a half page discussing the different sources of environmental variation that can influence the phenotype a breeder will observe