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(一)遗传病指的是由于遗传物质(染色体、DNA片段或基因)发生变化而引起的疾病或缺陷。是常见病,病种逐年增加,平均每年约增加100种左右,目前已知有3000多种。遗传病病种逐年增加的原因,一方面是由于环境中各种诱变源不断增加,引起新的突变而出现的新病种,如在显性遗传病中,约有1/5是新发生的突变。另一方面随着科学水平的不断提高,使许多过去不知道是遗传的病种,现在证明是遗传性的。还
(A) Genetic diseases are diseases or defects caused by changes in genetic material (chromosomes, DNA fragments or genes). Is a common disease, disease increased year by year, an average of about 100 kinds of increase every year, there are currently known more than 3,000 kinds. The reason for the increasing number of genetic diseases is that on the one hand new diseases occur due to the increasing variety of mutagens in the environment and new mutations that cause new mutations. For example, in dominant genetic diseases, about 1/5 are new occurrences The mutation. On the other hand, with the continuous improvement of the scientific level, many kinds of diseases that were not known to be genetic in the past have now proved to be hereditary. also