| |||
四元杂交四品种(或系群)分为两组,各自杂交,在产生杂种后,杂种间再进行第二次杂交 | |||
支票划线在支票上划一平行双线; 划双线 | |||
支票上划双线; 欺骗出卖; 出卖; 欺骗 | |||
支票上双划线 | |||
双杂交 | |||
双交叉 |
double crossing : 32 phrases in 8 subjects |
Agriculture | 11 |
Animal husbandry | 1 |
Cytogenetics | 3 |
Dermatology | 1 |
Genetics | 7 |
Molecular genetics | 1 |
Reproductive biology | 2 |
Technology | 6 |