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，次级卵母细胞又分裂两大等的新细胞：一相很大的卵（卵细胞）和一微的次级极体。

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.

目的探讨卵细胞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。