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遗传病概率问题一直是很多学生头疼的问题,特别是涉及到两种遗传病之间具有“自由组合”关系时,一般遇到这样的题,我们首先根据题意求出患一种病(患甲病或患乙病)的概率,再根据乘法原理计算,但是很多学生记不住公式或者容易记混淆。笔者在教学时直接用书本上的棋盘法来解决这类题,反而更易于学生理解和接受。下面就略举几例说明。例1(08.广州模拟)一个正常的女人与一个并指(Bb)的男人结婚,他们生了一个白化病且手指正常的孩子,求再
Genetic disease probability problem has been a headache for many students, especially when it comes to the relationship between the two genetic diseases have a “free combination” relationship, the general encounter such questions, we first determined according to the idea of suffering from a disease (Suffering from or sickness), and then calculated according to the principle of multiplication, but many students do not remember the formula or easily confused. The author directly in the teaching method of using the book board to solve these problems, but easier for students to understand and accept. The following is a brief description of a few examples. Example 1 (08. Guangzhou Simulation) A normal woman married a Bb man who had a normalized albino and finger child