本文在苗期的三个生长阶段利用聚丙烯酰胺凝胶电泳技术分别分析了糖甜菜初级三体系列及其对照二体的过氧化物酶同工酶,发现由于单条染色体的附加同工酶的分子表型有如下变异:基因剂量效应;同工酶酶带消失;新生带酶在丧失了的原有酶带附近出现;新生酶带的出现。作者详细分析比较了不同三体类型间及二体与三体之间同工酶分子表型的差异。本文讨论了分子表型变异的原因及其研究这种变异的可能意义。 In this paper, the three growth stages of seedling stage by polyacrylamide gel electrophoresis were analyzed sugar beet primary trisomy 3 series and its control body peroxidase isozymes found that as a single chromosome of the additional isozyme Molecular phenotypes have the following variations: gene dose effect; isozyme band disappears; nascent enzyme in the vicinity of the loss of the original band appears; the emergence of a new enzyme band. The author detailed analysis of different trisomy types and between the two body and trisomy between the isozyme molecular phenotype differences. This article discusses the causes of molecular phenotypic variation and its possible implications for studying this variation.