Fig. 3From: Experimental evolution under hyper-promiscuity in Drosophila melanogaster Experimental evolution of sex peptide (SP) and Dup99B gene expression. Mean levels of gene expression of (a) SP and (b) Dup99B in four experimentally evolved replicate populations each of the sex peptide receptor-deficient (SPR-) treatment (in which neither sex expressed SPR) and the control treatment. Gene expression was measured at generation 55. Error bars represent ± 2 S.EBack to article page