遗传漂变教学方法刍议

王春明, 林昌俊, 冯虎元

How to teach genetic drift

Wang Chunming, Lin Changjun, Feng Huyuan

表4 二项式定理及其展开式(a + b);n;

Table 4 Binomial theorem and its expansion (a + b);n;

n 项 各项系数 项数 公式 1 a b 1 1 2 (a + b);1; 2 a;2;abb;2; 1 2 1 3 (a + b);2; 3 a;3;a;2;bab;2;b;3; 1 3 3 1 4 (a + b);3; 4 a;4;a;3;ba;2;b;2;ab;3;b;4; 1 4 6 4 1 5 (a + b);4; 5 a;5;a;4;ba;3;b;2;a;2;b;3;ab;4;b;5; 1 5 10 10 5 1 6 (a + b);5; 6 a;6;a;5;ba;4;b;2;a;3;b;3;a;2;b;4;ab;5;b;6; 1 6 15 20 15 6 1 7 (a + b);6; ┇ ┇ ┇ ┇ ┇ n a;n;a;n-;;1;b a;n-;;2;b;2; ∙∙∙ a;2;b;n-;;2;ab;n-;;1;b;n; C;0;nC;1;nC;2;n…C;2n-2;2NC;2n-1;C;n;n n+1 (a + b);n;