Figure 1

Percentage of Drosophila melanogaster testis-biased and non-testis-biased expressed genes in two different gene expression datasets . Testis-biased expression profiles for D. melanogaster genes were obtained from Metta and Schlötterer [21]. Segmental dataset corresponds to the 21 movement cases selected by Metta and Schlötterer [21] from the original 46 cases in [23]. Excluded dataset corresponds to the remaining 26 cases. The number of testis-biased genes is significantly higher in the excluded dataset (**Fisher exact test, p = 0.0025), which implies that the filter used by Metta, and Schlötterer [21] disproportionally selected less testis-biased genes in the segmental dataset.