首次对中国北部品种同源转化群5单体单价体错分裂及单双极分布进行了研究。单体5A、5B 和5D 减数分裂后期Ⅰ错分裂频率分别为14.2%、9.2%和9.1%。中国春5A 具有最高错分裂频率(40.0%)。单体染色体或它们的错分裂产物的单极分布频率从18.6%到36.7%。双极分布频率比单极分布频率高,并随错分裂产物的增加而增加。一次、二次、三次错分裂频率差异很大。与欧、美品种相比中国北部品种同源转化群5错分裂行为与日本品种更相似。 For the first time, the body bifidobacteria splitting and single and bipolar distribution of monomeric units of homologous transformation population in northern China were studied. The frequency of Ⅰ cleavage at the late stage of meiosis in monomers 5A, 5B and 5D were 14.2%, 9.2% and 9.1% respectively. Chinese Spring 5A has the highest misclassification frequency (40.0%). Monopolar distribution frequencies of monomeric chromosomes or their misfolded products ranged from 18.6% to 36.7%. The bipolar distribution frequency is higher than the monopole distribution frequency and increases with the increase of the misfolded products. The frequency of first, second and third misdissections varies greatly. Compared with the European and American cultivars, the homologous transformation group in Northern China showed more similarities with the Japanese breed.