the final stage of the prophase in meiosis,characterized by shortening and thickening of the paired chromosomes,formation of the spindle fibers,disappearance of the nucleolus,and degeneration of the nuclear membrane

• 有丝分裂的最终阶段，以二价染色体的收缩、纺缍形纤维的形成、核仁的消失以及核膜的退化为特点