v.使回交

n.回交

Backcross with c ommon wheat had completely no seed set. 用普通小麥回交，未獲得回交后代。

The resistant level was declined with increasing of backcross generations. (2)在回交后代中，抗性水平逐代降低。

New forms of Josta, backcrossed to the black currant parent, may be better than original types. 水牛生產(chǎn)醋栗果媲美更豐富的空間較小

Dwarfing-sterile wheat was changed from winterness to springness by continue backcross. 摘要利用連續(xù)回交手段將矮敗小麥由冬性轉(zhuǎn)育為春性。

Methods The mice were bred in different ways,including crossbreed,backcross and intercross. 方法采用雜交、回交、互交的方法進(jìn)行培育;