银星竹鼠染色体组型的研究

A STUDY ON THE KARYOTYPE OF RHIZOLY PRUNOSUS

本文对银星竹鼠染色体数、染色体的相对长度、臂比、着丝粒指数进行研究。结果表明,银星竹鼠的二倍体染色数2n=50。染色体按其长短及着丝粒位置可分为A、B、C、D组。A组:NOs 1～7,染色体较大,为亚端着丝粒染色体。B组:NOs 8～15及X染色体,其中NO。9为st,NOs 8、13、X为M,NOs 10、11、12、14、15为SM染色体。C组:NOs 16～22,染色体较小,均为亚端着丝粒染色体。D组:N0s 23～24及Y染色体,为端着丝粒染色体。

This paper is a report on The karyotype of the Rhizolys prunosus. The relative lengths,arm ratio,and centromer index of the chromosomes have been analysed.The results show that the diploid number is 2n=50,which can be divided into 4 Groups(A.B.C.D.)according to the size and centromere position of the chromosomes.Group A including Nos 1～7 shows large chromosomes.Nos 8～15 and x-chromosome belong to Group B,in which pair 9 is subtelocentric(st),pairs 8,13 and x are metacentric(m),and pairs 10,11,12,14 and 15 are submetacentric(sm).Group C including Nos 16～22 shows small chromosomes,all of them are subtelocentric(st).Group D including Nos 23～24 is telocentric.