黑线姬鼠华北亚种染色体研究

本文采用骨髓染色体制片法,对分布于山东的黑线姬鼠华北亚种的染色体组型,C-带、G-带和银染核型进行了分析研究。其核型为2n=48=38 T+8 M+XY。X为较小的端着丝粒染色体,Y为组型中最大的染色体。几乎每个常染色体的着丝粒区都具异染色质。性染色体的异染色质丰富。No.10和No.18染色体具NOR(?)。每条染色体都显示出较清晰的G-带。同时对黑线姬鼠精母细胞的减数分裂进行了观察,并将山东标本与欧洲标本的核型进行了比较,其性染色体有显著差异。

STUDIES OF CHROMOSOME OF STRIPED FIELD MOUSE APODEMUS AGRARIUS PALLIDIOR (RODENTIA)

The karyotypes of Apodemus agrarius pallidior in zaozhuang, Shandong province were studied by the chromosome preparations of bone marrow cells. The diploid chro- mosome number was 48,and the karyotype was 2 n = 8 M + 38 T + XY.X was a small sized telocentric,and Y was the largest telocentric. The C-banded, G-banded and silver-stained karyotypes were observed. The results showed that C-bands were located at the centromeres of almost every chromosome pairs, and sex chromosomes were rich of heterochromatin.The chromosomes showed clear bands in G-banded karyotype. Ag-NORs were predominantly located at the 2 pairs of telocen-trics (No.10 and No.18 ).We compared the karyotype of Shandong specimens with that of European specimens, and also studied the chromosome behavior of meiosis.