Fig. 2From: Natural variation in Drosophila shows weak pleiotropic effectsGenomic and phenotypic evolution of the four founder replicates suggest that the evolved populations have approached the trait optimum of the new, hot environment. A The Principal Component Analysis of all SNPs shows that the divergence of the 4 replicates slows down at later generations. The absence of pronounced allele frequency changes from generation F110-130 suggests that all populations have approached trait optimum and selection does not cause further allele frequency changes. B The relative fecundity of the four replicates remains constant at later time points: F103 on the left F138 on the right panel. Because fecundity increased in all replicates [11], this suggests that the replicates have reached trait optimum, but the fitness component fecundity differs slightly between them. Because different assaying protocols were used for the two time points (M&M) we rescaled the fecundity measurements using the min-max normalization such that 1 is the highest number of eggs observed and 0 is the lowest number of eggsBack to article page