Many forest tree species have multiple archegonia which, after fertilization produce a number of proembryos.

许多林木树种都有颈卵器, 受精以后便产生许多原胚.

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After fertilization the layers of the integuments fuse and become thickened and pigmented.

受精作用后珠被各层发生融合并加厚着色.

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The amniotic epithelial cells ( AEC ) are formed from epiblasts on the 8 th day after fertilization.

羊膜上皮细胞是在受精后的第8天由外胚层形成.

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This last division and the expulsion of the second polar body occur only after fertilization.

这种最后的分裂和次级极体的淘汰只有在次级卵母细胞受精后才会发生.

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Proembryo A young plant after fertilization but before differentiation into embryo and suspensor tissue.

原胚:从受精卵分裂形成2细胞胚开始至胚芽和胚柄等器官分化之前的胚.

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