在后期双著绿点染色体将形成一个桥，无著绿点染色体单体形成一断片，此两者均可记录下来。
At anaphase the dicentric chromatid will form a bridge and the acentric a fragment, both of which can be scored.
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.
应用推荐