But in F2 generation group, the resistant ability was apparent separated.
而在F2代群体中，抗性出现明显分离。
The F2 generation of soybean was a generation with abundant genetic variations.
大豆F_2代是遗传变异最丰富的世代。
In the early generations the selection should not be too strict, and 15% selection intensity was suitable in F2 generation, but 10% was suitable in F3 and F4.
早期世代蛋白质含量的选择强度不宜太大，F2代的选择率以15%为宜，而F3和F4代的选择率以10%为宜。
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