form variation

• 型变异

form variation的用法和样例：

例句

1. 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。