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一、试题回顾(2014年全国卷Ⅰ32题)现有两个纯合的某作物品种:抗病高秆(易倒伏)和感病矮秆(抗倒伏)品种。已知抗病对感病为显性,高秆对矮秆为显性,但对于控制这两对相对性状的基因所知甚少。回答下列问题:(1)在育种实践中,若利用这两个品种进行杂交育种,一般来说,育种目的是获得具有优良性状的新品种。(2)杂交育种前,为了确定F2代的种植规模,需要正确预测杂交结果。若按照孟德尔遗传定律来预测杂交结果,需要满足3个条件:条件之一是抗病与感病这对相对性状受一对
A review of test questions (2014 national volume Ⅰ 32 questions) There are two homozygous crop varieties: disease-resistant stalk (easy lodging) and susceptible dwarf (lodging) varieties. Resistance to disease is known to be dominant, and tall stubs are dominant to dwarfs, but little is known about the genes that control these two pairs of relative traits. To answer the following questions: (1) In breeding practice, if the two breeds are used for crossbreeding, in general breeding aims at obtaining new breeds with excellent traits. (2) Before crossing breeding, in order to determine the scale of F2 generation, the result of hybridization needs to be correctly predicted. If you follow the Mendelian laws of inheritance to predict hybridization results, you need to meet three conditions: one of the conditions is disease and susceptibility of the relative traits by a pair