Bradley B P
Genetics. 1980 Aug;95(4):1033-42. doi: 10.1093/genetics/95.4.1033.
Populations of Drosophila melanogaster in constant 25 degrees and fluctuating 20/29 degrees environments showed increases in developmental stability, indicated by decreases in bilateral asymmetry of sterno-pleural chaeta number. In both environments, rates of decrease in asymmetry were greater under natural selection (control lines) than under artificial stabilizing selection. Overall mean asymmetry was greater in the fluctuating environment.--There was no evidence that decreased asymmetry was due to heterozygosity, and the decline in asymmetry was not explained by the decline in chaeta number in the lines under natural selection. However, the decline was consistent with changes in total phenotypic variance and environmental variance.--The divergence between lines after 39 generations of selection was seen in differences in asymmetry and also in the genotype-environment interaction expressed in cross-culturing experiments.
在25摄氏度恒定和20/29摄氏度波动的环境中，黑腹果蝇种群的发育稳定性有所提高，这表现为胸骨侧刚毛数量的双侧不对称性降低。在这两种环境下，自然选择（对照品系）下不对称性的降低速率都比人工稳定选择下的更大。在波动环境中，总体平均不对称性更大。没有证据表明不对称性的降低是由于杂合性，并且自然选择品系中不对称性的下降不能用刚毛数量的下降来解释。然而，这种下降与总表型方差和环境方差的变化是一致的。在39代选择后，品系之间的差异体现在不对称性的差异以及交叉培养实验中表达的基因型-环境相互作用上。
