7. 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 replicate of both fast and slow lines. There are 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 shows a correlated response in both fast and slow lines. At generation 10 correlated response to selection was also investigated. Mating success of D. ananassae flies of fast and slow lines was observed in an Elens-Wattiaux mating chamber and results indicate that flies of fast lines are more successful in mating than those of slow and control lines. Productivity of once-mated females was measured in terms of number of progeny produced per female and it is evident from the results that females of fast lines are more productive as compared to those of slow and control lines
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