臭鼩染色体的研究

本文采用骨髓染色体制片法,对捕自我国浙江萧山市的臭鼩进行了组型、G-带、C-带和核仁组织区银染的观察分析。结果表明,我国臭鼩染色体数目为2n=40,组型为8(m)+2(sm)+10(st)+18(t),性染色体为,(?):X(m或sm),Y(m或sm);♀:XX(m或sm)。G-带较为丰富,每一对染色体都有其特定的带型,较易于辨别与配对。在C-带方前,4对中间着丝粒染色体与5对亚端着丝粒染色体均具有不同程度的着丝粒带,1对亚中着丝粒染色体与9对端着丝粒染色体缺乏C-带物质,性染色体具丰富的远端带及中间带.银染的结果显示,第5、12和13对染色体具银染物质。

CHROMOSOME STUDIES OF HOUSE SHREW, SUNCUS MURINUS MURINUS (INSECTIVORA)

The karyotype of Zhejiang house shrew, Suncus murinus murinus in Xiaoshan has been studied from the chromosome preparations of bone marrow cell. The diploid chromosome number is 40, all autosomes are divided into four groups:8(m) +2(sm) +10 (st) + 18(t). X is a large sized metacentric or submetacentric chromosome. Y is a medium, sized metacentric or submetacentric chromosome. The G-banded, C-banded and silver-stained karyotypes have also been studied.The results show that each homologous pair has its own special G-banded patterns. C-bands are located at 10 pairs of chromosomes, among which 4 pairs are metacentrics, 5 pairs are subtelocentrics, the others are X and Y chromosome. According to the characteristics of banded patterns, the idiograms of G-banded and C-banded karyotypes were depicted, the chromosomes of G-banded and C-banded patterns were analyzed. Ag-NORs are predominately located at one pair of submetacentric and 2 pairs of subtelocentrics. In comparison with the chromosomes of the house shrew in the other parts of Asia, we found that G-banded and C-banded karyotypes of Chinese house shrew show certain differences from thpse of other Asiatic taxa.