棕色田鼠精母细胞中联会复合体的研究

Study on synaptonemal complexes in spermatocytes of Microtus mandarinus

以表面铺展法制备棕色田鼠精母细胞联会复合体标本，经硝酸银染色作电镜观察．结果表明，在减数分裂前期 Ｉ Ｘ 和 Ｙ 染色体的形态和行为同常染色体有明显差异； Ｘ Ｙ 染色体的配对起始于早粗线期，成熟于中粗线期，在晚粗线期先于常染色体解联会； Ｘ 染色体未配对区域自身折叠。

The surface spread and silver stained preparation of spermatocytes of Microtus mandarinus have been analyzed by electron microscopy. The results show that behavior and morphology of X and Y chromosome is different from autosomal SC during prophase Ⅰ of meiosis. Pairing of the XY starts at early pachytene and completes at middle pachytene. The disappearance of XY chromosome is forestalled as compared with autosomal SC at later pachytene. X chromosome twist at unpairing region forms hairpin like fold.