Abstract:The results of experiment using the techniques of chromosome analysis for studying natural population components of cotton aphid, Aphis Gossypii Glover, are reported in this paper. The somatic chromosome preparation of cotton aphid were prepared in the different periods. Karyotype analysis was based on chromosome length and G-banding patterns. The relusts show that the natural population of the aphid is a complex population consisted of the normal karyotype (NK), the 1,2 translocated and 1,3 translocated ka...