大壁虎的染色体及减数分裂联会复合体的研究

STUDIES ON THE MITOTIC KARYOTYPE AND SYNOPTONEMAL COMPLEX OF GEKKO GECKO

大壁虎(Gekko gecko)的染色体数目为2n=38,核型由2对中着丝粒(Nos.1.4.)、3对亚中着丝粒(Nos.2.3.5)及14对端着丝粒和亚端着丝粒(Nos.6—19)染色体组成。一对核仁组织者(NOR_s),位于第7对端着丝粒染色体的末端。同时,本文还对大壁虎的减数分裂以及联会复合体(S.C)的结构和组型,进行了详细的观察和分析。

The diploid chromosome number of the Gekko gecko is 38 for the 2 male and 2 female studied. The karyotype consists of 2 pairs metacentric elements (Nos. 1, 4 ); 3 pairs submetacentric (Nos. 2, 3, 5) and 14 pairs telocen-tric or subtelocentric elements (Nos. 6-19). No heteromorphic sex chromosomes is observed in the karyotype of Gekko gecko. A pair of Ag-NOR on the terminal of No. 7 chromosome is found. The identification and progression of the prophase stages of meiosis in Gekko gecko gonads are reported. With a combination of surface spreading and silver staining technique synaptonemal complex ( S, C ) of the Gekko gecko was studied by electron microscopy. The S. C karyotype of the Gekko gecko with 19 bivalents has been constructed.