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例1.(2003年新课程高考理综卷第26题)小麦 品种是纯合体,生产上用种子繁殖,现要选育矮杆 (aa)、抗病(BB)的小麦新品种;马铃薯品种是杂合体 (有一对基因杂合即可称为杂合体),生产上通常用 块茎繁殖,现要选育黄肉(Yy)、抗病(Rr)的马铃薯新 品种。请分别设计小麦品种间杂交育种程序,以及 马铃薯品种间杂交育种程序。要求用遗传图解表示 并加以简要说明。(写出包括亲本在内的前三代即 可)。
Example 1. (Introduction to Question 26 of the 2003 new curriculum college entrance examination theory) Wheat varieties are homozygous and are used for seed propagation in production. New varieties of wheat (aa) and disease-resistant (BB) are selected for breeding; potato varieties Heterozygous (heterozygous for heterozygous for a pair of genes). Usually used for tuber propagation in production, it is necessary to breed new varieties of yellow meat (Yy) and disease resistance (Rr). Please design cross-breeding programs for wheat cultivars and cross-breeding programs for potato cultivars. Requires a genetic illustration and brief description. (Write the first three generations, including the parent).