1960年丹弗市会议确定了人类染色体标准命名系统。奠定了人类染色体的研究基础。然而由于当时的研究方法还处于原始简单阶段,对于人类染色体的各项问题,所取得的研究结果不够完善,甚至在重要问题上得出错误的结论,例如先天性愚型的第21号三体,以及当时误认费城染色体为第21号染色体的缺失等。于1968～1971年Casperrson等人首创使用 The Danver City conference in 1960 established a standard system for human chromosome names. Laid the foundation for human chromosome research. However, since the research methods at that time were still in the primitive simple stage, the results obtained from the research on the human chromosomes were not perfect enough, and even led to erroneous conclusions on important issues such as congenital stupid T21 , And at that time, the Philadelphia chromosome was mistakenly identified as the deletion of chromosome 21. In 1968 ~ 1971 Casperrson et al first use