[The frequency distribution and establishment of fruit fly strain of segregation distorter in Drosophila melanogaster in China].

Segregation Distorter (SD) is a meiotic drive system of natural occurrence. Heterozygous SD/SD+ males transmit the SD chromosome in vast excess over the normal homolog. SD chromosomes have been recovered at low frequency (1%-5%) from almost every population that has been screened for them in many places of the world. To examine whether there is SD system in natural populations of Drosophila melanogaster in China, we surveyed a few populations of D. melanogaster in Beijing and Qingdao respectively. The results suggested that SD is also found in every population examined at frequency of 1%-5%. On the basis of learning distribution of SD in China, we established a fruit fly stoch of SD from wild population of D. melanogaster in Beianhe district of Beijing. Furthermore, instead of using traditional genetic hybridization, we used molecular approach, PCR, to examine the distribution of SD chromosomes, which has been proved a very effective, quick and convenient method.