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，级卵又分裂成两大不对等新：一相对很大卵子（成熟卵）和一微级极体。

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、卵裂期胚胎质量关系。