Stabilizing Selection for Pupa Weight in TRIBOLIUM CASTANEUM.
Stabilizing Selection for Pupa Weight in TRIBOLIUM CASTANEUM.
复制标题
赤拟谷盗中蛹重量的稳定选择。
作者：
P. Kaufman;F. D. Enfield;R. Comstock
赤拟谷盗蛹重稳定选择95代后，表型方差显著降低，加性遗传方差适度降低，但遗传力变化不大。不育性显着较低，平均数的活后代，每肥沃的交配是显着较高的稳定选择的人群进行随机选择的群体相比。结果表明，更多的遗传变异被维持比预期的，除非一小部分的基因有杂合子优势的健身规模。表型方差的减少表明，在实验过程中，具有稳定选择的群体对环境来源的变异变得更加缓冲。
Ninety-five generations of stabilizing selection for pupa weight in Tribolium castaneum resulted in a significant decrease in phenotypic variance, moderate reductions in additive genetic variance, but only slight changes in heritability for the trait. Sterility was significantly lower and the average number of live progeny per fertile mating was significantly higher in populations where stabilizing selection was practiced as compared with random selected populations. The results indicate that more genetic variability is being maintained than would be expected unless a fraction of the genes have a heterozygote advantage on the fitness scale. The reduction in phenotypic variance indicated that the populations with stablizing selection became somewhat more buffered against environmental sources of variation over the course of the experiment.