赤链蛇染色体组型、C带和Ag-NORs的研究

Studies on the Karyotype,C-banding Pattern and Ag-NORs of Dinodon rufozonatum

以骨髓细胞为材料研究赤链蛇的染色体 ,结果表明该物种 2n =46 ,由 8对大型的和 15对微小的染色体组成 ,AF =5 0。性染色体的大小介于 3号和 4号之间 ,为ZW型 ;8对大型染色体均显示着丝粒C带 ,1- 6号还显示浅染端粒C带。W染色体为整条C带阳性 ;该物种一对NOR位于 7号染色体近着丝粒区。不同地理分布群赤链蛇核型可能经历过Z与W染色体不等交换。

The Karyotype, C-bands and Ag-NOR s of Dinodon rufozonatum(Cantor) reported is in this paper including the diploid number(2 n =46)comprising 8 pairs of macro-and 15 pairs of microchromosomes,and AF=50 in the D.rufozonatum. The sex chromosome in size locates between the autochromosones No.3 and No.4,which belongs to ZW type. The C banding technique revealed that the all macrochromosomes there are centromerc C band,the telomeric C band was only observed in Nos.1～6,while a whole W chromosome is constitutive heterochromatinization.Two NOR were observed on the pericentric of the No.7 chromosome.