花粉母细胞染色体数不恒定，后期两极染色体数分配不均等。
So were chromosomal deficiency or reproduction, and unequal division in the period of pollen mother cell.
中心体作为细胞的主要微管组织中心，在细胞周期过程中建立两极纺锤体，调节细胞有丝分裂，从而对维持染色体的稳定起着重要的作用。
The centrosome, the major microtubule organizing center regulates cell division through forming bipolar mitotic spindles and plays an essential role in the maintenance of chromosomal stability.
染色体在两极分布不均衡；
The distribution of chromosomes was unequal, and some univalents divided.
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