two chromatids of each chromosome stay joined at the centromere 着丝点 and move together to one of the two poles of the cell. It is this event that results in the halving 减半的 of the chromosome number in the four daughter cells that result from meiosis.正如在有丝分裂中一样,两个同源染色单体通过蛋白质和RNA桥配对形成联会复合体。与有丝分裂不同的是,每组染色体的两个染色单体连接在着丝点上并一起移向细胞两极的一级。由此而导致4个子细胞染色体数减半。