phenotypic variance

例句：

1. 1. The study of genetic variation is crucial for understanding the evolution of species.
   研究遗传变异对于理解物种的进化至关重要。
2. 2.Variations in phenotype can be caused by environmental factors or genetic mutations.
   表型变异可能是由环境因素或基因突变引起的。
3. 3. In this experiment, we measured the phenotypic variance between different genotypes.
   在这个实验中，我们测量了不同基因型之间的表型变异。