摘要
采用PHA活体处理直接制片,对黄鳝染色体进行Giemsa染色、C-带及Ag-NORs等相继系列研究。结果发现,黄鳝的染色体Ag-NORs具有明显的个体特异性的数目多态、分布多态和形态多态现象。11尾被检测个体中,多态特征可分为4种类型。位于第3或第7号染色体臂内的次缢痕是Ag-NORs所在的区域,该区域分布有大量的结构异染色质,即Ag-NORs与C-带强阳性呈现严格的同步对应。本文根据实验结果,对黄鳝AS-NORs多态性的发生机制及其与结构异染色质的关系进行了探讨。
The results of sequential treatments for Ag-NORs polymorphisms in Monopterus albus are reported. Four types of Ag-NORs polymorphisms, varying in form, number, and location haw been detected respectively. The Ag-NORs polymorphisms were individually specific, and the distributions of Ag-NORs, secondary constrictions and positive C-bands were coincident. The mechanism of Ag-NORs polymorphisms and their relations to constrictive heterochroma-tin are discussed.
基金
国家自然科学基金
