论文部分内容阅读
2015·山东模拟卷中有一道遗传选择题,大多数学生第一次做的时候都觉得无从入手。下面我就此题提出两种解法。例题:(2015·山东模拟)已知水稻的抗旱性(A)和多颗粒(B)属显性,各由一对等位基因控制且独立遗传。现有抗旱、多颗粒植株若干,对其进行测交,子代的性状分离比为抗旱多颗粒:抗旱少颗粒:敏旱多颗粒:敏旱少颗粒=2∶2∶1∶1,若这些亲代植株相互授粉,则后代性状分离比为()
2015 · There is a genetic multiple choice question in the Shandong simulation volume. Most students find it impossible to do this for the first time. Here I propose two solutions to this problem. Example: (2015 · Shandong Simulation) It is known that drought resistance (A) and multiparticulate (B) in rice are dominant, each controlled by a pair of alleles and inherited independently. Existing drought-resistant, multi-grain plants, to test its cross, the offspring of the trait segregation ratio of drought-resistant multi-grain: drought less grain: drought more grains: less drought particles = 2: 2: 1: 1, if these The parental plants pollinated each other, the offspring trait separation ratio ()