基因型fxfx AA1/4a1/4a1/4a2 2 Aa1/2d1/2d1/2d aa1/4-a-1/4a1/4a2 d1/2d-2+-4 AA1/2a1/2a1/2a2 B1 Aa1/2d1/2d1/2d2 1 d -+ Aa1/2d1/2d1/2d2 B2 a1/2-a-1/2d1/2a2 1a+d---a-a+-d 1818 基因型 f x fx fx2 AA 1/ 4 a 1/ 4 a 1/ 4 a2 Aa 1/ 2 d 1/ 2 d 1/ 2 d2 aa 1/ 4 -a -1/ 4 a 1/ 4 a2 ∑ 1 d 1/ 2 d －a 2 + －d 2 1 2 1 2 F2 B1 AA 1/ 2 a 1/ 2 a 1/ 2 a2 Aa 1/ 2 d 1/ 2 d 1/ 2 d2 ∑ 1 d －a+－d －a 2 + －d 2 1 2 1 2 1 2 1 2 Aa 1/ 2 d 1/ 2 d 1/ 2 d2 aa 1/ 2 -a -1/ 2 d 1/ 2 a2 ∑ 1 -a+d －d -－a －a 2 + －d 2 B2 1 2 1 2 1 2 1 2