A Complete Collection of 100000 Whys
Fav十万个为什么
为什么有些病会遗传？
1、遗传病是由基因突变引起的，这些突变可以遗传给后代。基因是决定我们身体特征的遗传单位，如果基因发生错误，可能会导致疾病。
2、染色体异常也是遗传病的一种原因。人类有23对染色体，如果染色体数量或结构异常，可能会导致遗传疾病，如唐氏综合征。
3、某些遗传病是由单基因遗传的，这意味着只需要从父母一方继承一个有问题的基因就会患病，如囊性纤维化。
4、多基因遗传病是由多个基因共同作用引起的，这些基因的变异会增加患病的风险，如心脏病和糖尿病。
5、环境因素有时会触发遗传易感性。即使一个人有遗传病的风险，也需要环境因素的作用才会发病，如肺癌与遗传和吸烟共同作用。
总之，遗传病是由于基因突变、染色体异常、单基因或多基因遗传以及环境因素共同作用的结果，这些因素使得某些疾病可以遗传给后代。
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