Search Result for "polygene": 
Wordnet 3.0

NOUN (1)

1. a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations; 



WordNet (r) 3.0 (2006):

polygene
    n 1: a gene that by itself has little effect on the phenotype
         but which can act together with others to produce
         observable variations