F2 the second filial generation , obtained by crossing or selfing within the f1 generation 子二代(杂种二代) : ,通过子一代内部的杂交或自交获得。
If the characteristic is governed by simple mendelian genes , the typical monohybrid and dihybrid ratios become apparent in the f2 generation 如果其特征取决于单一孟德尔基因,那么典型的单基因杂种和和双基因杂种的遗传比率将在子二代呈现。