这个男孩经历了一次尤其剧烈的突变，他的第五条和第七条染色体各有一个片段互相交换了位置。
He had experienced a particularly dramatic mutation, in which a piece of chromosome 5 had been swapped with a piece of chromosome 7.
静脉采血检测染色体畸变、姊妹染色单体交换（SCE）、细胞微核的发生率。
The mean frequencies of chromosome aberration (CA), sister chromatid exchange (SCE), and micronucleus(MN) were analysed.
目的与方法：单细胞凝胶电泳技术(SCGE)、姐妹染色单体交换法(SCE)和染色体畸变分析法均能被用来检测dna的损伤或修复。
Purpose and methods: Single cell gel electrophoresis (SCGE), sister chromatid exchanges (SCE), chromosome aberrations are three methods to determine DNA damage and repair.
研究发现，SO_2及其衍生物可引起人外周血淋巴细胞、小鼠骨髓细胞、中国仓鼠肺成纤维细胞等哺乳动物细胞的染色体畸变、姊妹染色单体交换及微核的形成。
Several studies have shown that SO2 and its derivatives could induce chromosomal aberrations, sister chromatid exchanges and micronuclei in human blood lymphocyte, bone marrow cell in mice and CHL.
结果表明：DCAP是一种染色体损伤剂，诱发的畸变主要为染色单体断裂和交换；
Results showed that DCAP was clastogen and the aberrations were mainly chromatid breaks and exchanges.
黄颡鱼初级精母细胞的前期出现联会复合体，应是同源染色体之间进行同源基因交换的标志。
The prophase of primary spermatocyte would appear synaptonemal complex, which should been the symbol that the homologous chromosome carried through the change of homologous gene.
它与同源染色体联会、遗传交换、染色体分离密切相关。
The structure is closely related with homologous chromosomes synapsis, recombination and segregation.
再有，我们可以找出这些基因倾向于在染色体上分布的区域，研究显示，远离染色体着丝粒的基因更倾向于交换，发生重组。
What's more, we can find these genes tend to distribute on chromosomes, and research shows that the genes far from the centromere are more likely to exchange and recombine.
结果：实验组小鼠胚胎外表正常，各器官发育良好，骨骼透明度良好，胚胎染色体未发现缺失、重排、异常交换等。
Results: the embryo shape of experimental mice was normal, with the growth of organs and skeleton in good situation.
减数分裂是在配对的染色体交换DNA和细胞内染色体数目减半时的一种细胞分裂。
Failure has often struck at the stage of meiosis, a type of cell division during which paired chromosomes swap DNA and the number of chromosomes per cell is halved.
例如，慢性粒细胞白血病(chronic myeloid leukemia)是一种血细胞癌症，其癌细胞中总会发生9号染色体与22号染色体之间部分的交换。
For example, patients with chronic myeloid leukemia, a blood cancer, nearly always have swapped pieces of chromosomes 9 and 22 in their cancer cells.
例如，慢性粒细胞白血病(chronic myeloid leukemia)是一种血细胞癌症，其癌细胞中总会发生9号染色体与22号染色体之间部分的交换。
For example, patients with chronic myeloid leukemia, a blood cancer, nearly always have swapped pieces of chromosomes 9 and 22 in their cancer cells.
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