陕西省吴堡县宋家川中学的薛剑平同志曾对现行的高中生物课本第34页关于动物细胞有丝分裂的模式图提出疑问。如按照课本所画在有丝分裂末期的子细胞中已各有两对中心粒了,那么中心粒究竟是在什么时候复制的呢?他的问题提得对。实际上,不仅中学课本,一些新出版的大学课本中也有同样的错误或疏忽。 Comrade Xue Jianping of Songjiachuan Middle School in Wubei County, Shaanxi Province, once raised questions about the current high school biology textbook page 34 on animal cell mitosis. If according to the textbook, there are already two pairs of centrioles in each of the late mitotic daughter cells, then exactly when is the centriole duplicated? His question is right. In fact, not only secondary school textbooks, but also the same mistakes or omissions in some newly published university textbooks.