Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.

目的探讨卵细胞第一极体形态与受精卵形态、卵裂胚胎质量的关系。

The secondary oocyte now divides again into two new cells of unequal size: a relatively large ootid (mature egg cell) and a minute second polar body.

，级卵母细胞又分裂成两个大小不对等的新细胞：一个相对很大的卵子（成熟卵细胞）和一个微小的级极体。