Figure 1.—
Male SRR genes have fewer detectable orthologs in comparison to female SRR or non-SRR genes. Percentages of D. melanogaster male, SFP, female, FRTP, unbiased, and nonsex and non-SRR genes with detectable orthologs over phylogenetic distance. The total number of D. melanogaster genes in each class is given in parentheses. The representation of the phylogenetic relationship among Drosophila species is according to FlyBase.