单词：second filial generation
second filial generation的用法和样例：
例句
- 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。
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