染色体平衡易位通常是两条染色体发生断裂后形成的两个断片,发生交换连接而成两条衍生染色体,只是改变了断裂节段在染色体上相对位置,不发生遗传物质的丢失和增加。通常不引起明显的遗传效应,故携带者是带有染色体结构异常但表型正常的个体。根据夏家辉等在长沙的调查,携带者在我国的发病率为0.47%,即106对夫妇中就有一 Chromosomal equilibrium translocation is usually two fragments of two chromosomes rupture formed after the exchange of two derived chromosomes, but changed the relative position of the broken segment in the chromosome without loss of genetic material and increase. Usually does not cause significant genetic effects, so carriers are with chromosomal abnormalities but normal phenotype individuals. According to a survey conducted by Xia Jiahui in Changsha, the incidence of carriers in China is 0.47%, that is, there are 106 couples