Organization of the four genomic regions investigated on the neo-sex chromosomes. (A) The exu1 region (Bachtrog 2003a). A total of ∼40 kb of neo-X and ∼45 kb of neo-Y sequence was investigated. (B) The mle genomic region. Here 8 kb of neo-X- and 25 kb of neo-Y-derived sequence were analyzed. (C) The robo genomic region. A total of 6 kb of neo-X and 11 kb of neo-Y sequence was analyzed. (D) The dpn genomic region. Here 24 kb was analyzed from the neo-X chromosome, and 17 kb from the neo-Y. Protein-coding genes are shown as gray bars, and transposable element insertions are displayed as red bars. Amino acid changes are indicated as gray triangles, premature stop codons are displayed as red triangles, and deletions destroying the reading frame of the protein are represented as blue bars.
