parent population

At the same time, we used these extreme materials as parent to structure F2 population.

同时利用这两极端材料作亲本构建了F2群体。

In this paper we employ urban household data collected by Institute of Population and Labor Economics to present the evidence of shocks to parent employment on the college enrollment decision of kids.

本文使用中国社会科学院人口与劳动经济所的城市住户调查资料，分析了父母的就业冲击对子女大学入学决策的影响。

The simulant genetic optimization shows that the genetic drift induced by multi-parent occurrence-based scanning crossover reduces both the population diversity and the convergence rate, thus deteriorating the performance of an evolutionary search.

应用基于基因出现频率的多父代扫描交叉的仿真遗传优化实验的数据表明，重组的遗传漂移不但导致种群多样度的急剧下降，而且降低了进化搜索的收敛速度，从而降低了进化搜索的性能。

The average heterosis of F2 over mid-parent based on population mean was-1.99% to 1.11% for all these traits. It suggests that little inbreeding depression exists for F2 and F3 seeds.

按群体平均数计算，这些性状F2的中亲优势仅为－1.99%～1.11%，这揭示出F2、F3近交衰退很少。