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遗传概率的计算是高中遗传学的重点,学生容易将一对等位基因的杂合子的自交和随机交配相混淆,尤其在涉及aa胚胎致死即逐代淘汰aa个体等特殊情况下的遗传概率的计算时,更是广大学生以及部分教师感到困惑的地方.笔者归纳了一对等位基因的杂合子(Aa)在几种常见情况下Fn代中各基因型频率的计算规律.一、连续自交Fn代中各基因型频率的计算1.无选择作用例1让基因型为Aa的个体自交n代,则Fn代中AA、
The calculation of genetic probability is the focus of high school genetics. Students are apt to confuse the selfing and random mating of a heterozygote of a pair of alleles, especially in the special cases involving the death of aa embryo, ie aa individuals The calculation is even more confusing for the majority of students and some teachers.The author summarizes the calculation of the frequency of each genotype of Fn generation in several common cases of heterozygotes (Aa) of alleles. Inbred Fn generation in the calculation of the frequency of each genotype 1. No choice of role Example 1 let the genotype Aa self-self n generation, then Fn generation AA,