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.

youdao

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.

youdao