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染色体是否发生畸变,决定于染色体内部遗传物质是否受到环境条件的影响,因为“外因通过内因而起作用”。这里仅介绍放射线和化学因素在染色体发生畸变中所起的作用。(一)放射线电离辐射使人类受到遗传学上的危害,已成为公认的事实。染色体发生畸变表明了细胞内部遗传信息的变化,这种变化势必要影响到正常的生理机能,而生殖细胞的染色体发生畸变,其特性必将传递到下一代,导致遗传上的缺陷。例如曾在妊娠初期,母体骨盆部位因医
Chromosome aberrations, depending on the chromosomal internal genetic material is affected by environmental conditions, because “external factors through the internal work.” Only the role of radiation and chemical factors in chromosomal aberrations is described here. (I) It has become a recognized fact that radiation ionizing radiation causes genetic damage to human beings. Chromosomal aberrations indicate changes in intracellular genetic information, which is bound to affect the normal physiological function, while the germ cell chromosome aberrations, its characteristics will be passed to the next generation, resulting in genetic defects. For example, in the early pregnancy, maternal pelvic area due to medical treatment