Data for: A predominant role of genotypic variation in both expression of sperm competition genes and paternity success in Drosophila melanogaster

The study focuses on investigating the impact of both environmental and genotypic variations on the expression of sperm competition genes and relative paternity success (i.e. second male paternity; P2) in Drosophila melanogaster. To address this, the research leverages the Drosophila Genetic Reference Panel (DGRP) inbred lines and introduces manipulation of developmental population density, specifically larval density. This experimental design allows for the examination of the effects of genotype, environment, and potential genotype-environment interactions (GEI) on the expression of seminal fluid genes, namely Sex Peptide, Acp36DE, and CG9997 and sperm competitiveness. In light of the observed genotypic influence on genes' expression, a genome-wide association study (GWAS) was also conducted for Sex Peptide and Acp36DE.