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染色体易位是常见的染色体结构异常,自然界中的物理、化学、生物等因素都可能使染色体发生断裂,当两条染色体同时发生断裂,其染色体的片段接合到另一条染色体上即形成易位,包括相互易位、罗伯逊易位和复杂易位等。这类易位大多数都保留了原有基因总数,对基因作用和个体发育一般无严重影响,故称平衡易位。由于易位一般没有遗传物质的增减,染色体易位携带者通常无表型异常,但在生殖细胞减数分裂过程中,可产生各种不平衡重
Chromosomal translocation is a common chromosomal structural abnormalities, the physical, chemical, biological and other factors in nature may make the chromosome rupture, when the two chromosomes simultaneously rupture, the chromosome fragments joined to another chromosome that is the formation of translocation, Including reciprocal translocation, Robertson translocation and complex translocation. Most of these translocations have retained the original total number of genes, gene function and development of individuals generally do not have a serious impact, it said that the balance of translocation. As translocations generally do not increase or decrease in genetic material, chromosomal translocations are usually no phenotypic abnormalities, but during germ cell meiosis can produce a variety of imbalances