The chiasmata can slip off the ends of the bivalents, and thus chiasma frequency may be reduced by terminalization.有时交叉可以从二价体末端处滑开，因此移端过程可以降低交叉频率。
Mean meiotic chromosome association and chiasma frequency of the three hybrids were 7. II+0. II+0.0III,0.;杂种减数分裂中期 PMC染色体平均配对频率和交叉结频率分别为7. Ⅰ+0. Ⅱ+0.0Ⅲ,0.;