近年来,随着人类染色体技术的迅速发展,使细胞遗传学的研究达到了新的高峰。这不仅极大的加深了人们对染色体的认识,而且推动了医学和生物学的发展。特别是医学细胞遗传学的产生对研究医学基础理论与指导医疗实践愈来愈具有重要作用。由于我国地域辽阔,自然环境互有不同,各地区分 In recent years, with the rapid development of human chromosome technology, the research of cytogenetics has reached a new peak. This not only greatly deepens people’s understanding of chromosomes, but also promotes the development of medicine and biology. In particular, the emergence of medical cytogenetics plays an increasingly important role in the study of basic theories of medicine and in the guidance of medical practice. Due to the vast territory of our country, the natural environment is different from each other and is divided across regions