Where Do Male Genes Live?

Abstract
One might predict that in males, genes that are expressed in male-specific tissues such as the testis would be found on the single X chromosome (the Y chromosome containing very few functional genes). Not so, explains Schlötterer in his Perspective, which discusses new work showing that in the fruit fly male-biased genes are found predominantly on the autosomes and not on the X chromosome (Parisi et al.).