Singh S R, Singh B N
Department of Zoology, Banaras Hindu University, Varanasi, India.
Behav Genet. 2001 Jul;31(4):361-70. doi: 10.1023/a:1012270318276.
In Drosophila ananassae, artificial selection was carried out for fast and slow remating speed for 10 generations. Response to selection resulted in rapid divergence in remating time in each of two replicates of both fast and slow lines. There were significant differences in mean remating time in females among fast, slow, and control lines. Regression coefficients for both fast and slow lines are significantly different from zero. The realized heritability over 10 generations of selection is from 0.26 to 0.33 for two replicates of fast line and from 0.23 to 0.27 for two replicates of slow line. These findings suggest that female remating time in D. ananassae is under polygenic control. Remating frequency of females showed a correlated response in both fast and slow lines. At generation 10, correlated response to selection was also investigated. Mating propensity of D. ananassae of fast and slow lines was observed in an Elens-Wattiaux mating chamber. Fifteen pairs per test showed that on the average, the fast lines (11.20, 11.60) were more successful in mating than those of slow (6.40, 5.60) and control (8.00) lines. Productivity of once-mated females was measured in terms of number of progeny produced per female and the results of productivity analysis indicate that females of fast lines (157.83, 130.83) produced more progeny compared with slow (72.70, 85.83) and control (109.23) lines.
在拟果蝇中，针对快速和慢速再次交配速度进行了10代的人工选择。选择反应导致快速和慢速品系的两个重复样本中的每一个在再次交配时间上迅速分化。快速、慢速和对照品系的雌性平均再次交配时间存在显著差异。快速和慢速品系的回归系数均显著不同于零。快速品系两个重复样本在10代选择中的实现遗传力为0.26至0.33，慢速品系两个重复样本的实现遗传力为0.23至0.27。这些发现表明，拟果蝇的雌性再次交配时间受多基因控制。快速和慢速品系中雌性的再次交配频率都表现出相关反应。在第10代时，还研究了对选择的相关反应。在埃伦斯 - 瓦蒂奥交配室中观察了快速和慢速品系拟果蝇的交配倾向。每次测试15对果蝇，结果显示，平均而言快速品系（11.20，11.60）的交配成功率高于慢速品系（6.40，5.60）和对照品系（8.00）。根据每只雌性产生的后代数量来衡量一次交配雌性的繁殖力，繁殖力分析结果表明，快速品系的雌性（157.83，130.83）比慢速品系（72.70，85.83）和对照品系（109.23）产生的后代更多。
