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.

此时，次级卵母又分裂大小不对等的新：一相对很大的卵子（熟卵）一微小的次级极体。

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.

目的探讨卵第一极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。