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【单选题】
关于体内受精和早期胚胎培养的叙述，错误的是（）A.
排卵时，从卵泡内排出的是初级卵母细胞或次级卵母细胞
B.
精子入卵后会形成雄原核，雄原核一般略大于雌原核
C.
卵黄膜封闭作用发生在精子接触卵黄膜时
D.
卵子的发生是在雌性动物的卵巢内完成的
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A.
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