云南褐家鼠和黄胸鼠染色体比较研究

本文报道了云南省昆明地区褐家鼠（Ｒａｔｔｕｓｎｏｒｖｅｇｉｃｕｓ）和黄胸鼠（Ｒａｔｔｕｓｆｌａｖｉｐｅｃｔｕｓ）的核型．其染色体数目均为４２．其中褐家鼠含有十一对端或亚端着丝粒染色体、二对亚中着丝粒染色体、七对中着丝料染色体和一对性染色体；而黄胸鼠核型中，具有十三对端或亚端着丝粒染色体．七对中着丝染色体和一对性染色体．另外，文章还对这二种动物的染色体进行了Ｇ分带、Ｃ分带和银染色研究，探讨了二者的亲缘关系以及它们在家鼠属（ＧｅｎｕｓＲａｔｔｕｓ）动物中的演化关系．

A Comparative Study of the Karyotypes of Rattus novegicus and Rattus fiavipectus

A comparative study of the karyotypes of Rattus norvegicus and Rattus fiavipectus in the suburbs of Kunming city were carried out based on the chromosome preparations of the bone married cells. The results show that they have the same diploid number of 2n=42and similar chromosome characters. The karyotypic differences between R. norvigicus and R. flavipectus is only in that 2 pairs of submetacentrics of the former replace 2 pairs of telocentrics of the latter. In this paper.G-,C-and N - banded chromosomes analyses of these two species were reported. Finally the phylogenetic relationship and classfical position of R.norvegicus and R. flavipectus have been also discussed.