一道遗传题,在课堂上讲解了几次,学生总听不懂,不是因为题太难,而是这道题改编得巧妙,同时在讲解过程中,作者发现这是一道错题。命题者面对这样一道好试题,却没有给出正确答案,这不得不说是一种遗憾。许多老师做此题时,会按照文中所说的三种的分析推理方法进行,对参考答案都不敢质疑。 A genetic problem, explained several times in the classroom, the students do not always understand, not because of the title is too difficult, but the problem is adapted cleverly, while explaining the process, the author found that this is a wrong title. Proponents face such a good test, but did not give the correct answer, which have to say is a pity. Many teachers do this question, will be in accordance with the article said three kinds of analytical reasoning methods, the reference answers are not questioned.