The male and female pronucleus fused finally.Most hybrids could develop normally.

成熟的核形成后完成融合过程，形成合核，受精过程结束。

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.

目的探讨卵细极体形态与核期受精卵形态、卵裂期胚胎质量的关系。