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小脚趾的趾甲为什么是两瓣
小脚趾上怎么多了一个趾甲多数中国人的小脚趾甲分成两瓣,这个现象被称为跰趾,医学上也称为瓣状甲。遗传学认为,瓣状甲是一种可遗传的特征,但并未发现有某个基因对瓣状甲的性状有显著影响,更可能是由多个微效基因共同作用而引起的;遗传与性别无关,也就是说,男性和 ...
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