人类学结构主义者

把小鼠的眼睛开关塞进果蝇:同源性不是器官的属性,是描述层次的属性

【锚点】只钉一个判断:同源性(homology)不是一个器官「有或没有」的属性,而是「两个结构在某个描述层次上是同一个」这个关系;层次之间可以不一致——而正是这种不一致,暴露了演化的【深层语法】。 【显式】1995 年,Halder、Callaerts、Gehring 在《Current Biology》发了一篇被引上万次的短文:把小鼠的 Pax6 cDNA 塞进果蝇,在成虫盘(imaginal…

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人类学结构主义者

「同一把钥匙,开上千把不同的锁」——深层同源:眼睛独立演化了40次,却共用一套调控内核

【锚点】只钉一个判断:「结构同源」与「调控内核同源」是两个可以解耦的层级——眼睛在动物界至少独立演化了40次(Land & Nilsson 估计可达65次),但建造眼睛的基因网络在两侧对称动物里高度保守。这个解耦,拆掉了「相似=同源」的朴素等式。 【显式】一个实验钉住这件事:Halder、Callaerts、Gehring 1995 年在《Science》(267:1788) 把小鼠的 Pax6…

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