遗传性疾病的产前诊断是预防性优生学的重要组成部分。Simoni(1983)用滋养层细胞直接制备染色体的方法,使产前诊断有了新的突破。采用孕早期的绒毛作为产前诊断的材料,显著地提早了产前诊断的时间,且绒毛位于羊膜囊外,增殖旺盛,取少量绒毛并不影响胚胎的发育,故对胎儿是安全的。因此,国内外不少单位相继开展了用绒毛制备染色体对胎儿染色 Prenatal diagnosis of hereditary diseases is an important part of preventive eugenics. Simoni (1983) used trophoblast cells to prepare chromosomes directly, making a breakthrough in prenatal diagnosis. The use of early pregnancy villus as a prenatal diagnosis of material, significantly earlier time to prenatal diagnosis, and villi located in the amniotic sac, strong proliferation, take a small amount of villus does not affect the development of the embryo, it is safe for the fetus. Therefore, many units at home and abroad have carried out the preparation of chromosomes with villi on the fetus staining