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世界人类十大最坏的遗传后果(组图)(7)
2007-03-16 09:24:28 中华网论坛 【 发表评论
  

3.色盲
13992474_2007031609251022162600.jpg


  美国有超过1000万人不能分辨红色和绿色,然而这些患者中仅有60万是女性,这是为什么呢?因为负责形成红绿感受器的基因位于X染色体,男性仅有一个继承自母亲的X染色体,而女性有两个。因此对女性来说,即使其中一个基因出现异常,另一个正常基因也能单独工作。
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