Term: polygene: a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations
Broader: gene: (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Unrelated: tree lupine: evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia