Two nonallelic genes affect the same character and enhance each other's effect. 两个非等位基因影响同一性并能增强彼此的效应。
Polygene is any of a group of nonallelic genes,each having a small quantitative effect,that together produce a wide range of phenotypic variation. 多基因是一种非等位基因，每一个基因都有很小量的效果，这些效果合在一起产生出很多种表现型变异。
