人类之所以能够分清颜色,在眼晴为什么能看到东西中就曾提到,主要就是由于视锥细胞的作用,视锥细胞最善于分辨强光和颜色,能够内部的感光物质感受到每种颜色反射出的光线,而颜色之所以不同,就是因为它们所反射的波长不同,所以按照波长,视锥细胞也被分为长波视锥细胞,中波视锥细胞和短波视锥细胞,这样就能感受到不同的颜色波长了。而有人分不清颜色,则是因为视锥细胞功能出现了障碍,或者只有两种视锥细胞,而大多数情况下是由于遗传导致的,还有少数后天性色盲则是由于眼部的相关疾病导致了视锥细胞的损伤。其中红绿色盲就可能是缺少了某个视锥细胞,导致无法分辨某一种波长的颜色。而色盲之所以男性遗传的概率更大,是因为决定是否是色盲的两对基因位于X染色体上,而它们的遗传方式是隐性的,但男性只有一条X染色体,所以男性只要接受了一个色盲基因,就会显露出来色盲,而女性本身就携带了两条X染色体,所以必须有两个都被赋予色盲基因,才能显现出来,不然就只会隐藏在基因中。
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