1问题李晓东[内蒙古乌兰浩特一中(137400)]人教版高中教材《生物·选修3·现代生物科技专题》P.65有这样的描述:“精子入卵后的另一个变化,是尾部脱离,并且原有的核膜破裂;随后,精子形成一个新的核膜,最后形成一个比原来精子核还大的核,叫作雄原核。与此同时,精子入卵后被激活的卵子完成减数第二次分裂,排出第二极体后,形成雌原核,雌原核一般略小于雄原核。”为什么雄原核比精子核大?雌 1 problem Li Xiaodong [Inner Mongolia Wulanhaote I (137400)] PEP high school teaching materials “Biology · Elective 3 · modern biotechnology topics” P.65 has such a description: “Another sperm into the eggs after another change is tail off , And the original nuclear membrane rupture; Subsequently, the sperm form a new nuclear membrane, and finally form a larger nucleus than the original sperm nucleus, called the male pronucleus.At the same time, the sperm into the egg is activated after the egg is completed by The second split, the discharge of the second polar body, the formation of female pronucleus, the female pronucleus is generally slightly smaller than the male pronucleus. ”Why male pronucleus than the sperm nucleus?