Figure 2: Poor sequence homology of the sex-determining region between Y and X chromosomes.
From: Co-option of Sox3 as the male-determining factor on the Y chromosome in the fish Oryzias dancena
Dot-plots comparing the Y chromosome sequence to the X chromosome sequence (a), and the Y chromosome sequence to itself (b). The Y and X sequences are aligned at the left and right regions, but not in the middle of the Y chromosome region except for local duplications shared between the Y and X chromosomes (a). The single diagonal line in the Y–Y comparison shows that the sequence aligns over its entire length, and the smaller lines above and below the diagonal indicate multiple local duplications contained in this region of the Y chromosome (b). Blue and purple boxes indicate gene regions, and the arrows indicate the direction of transcription. Black boxes indicate known repeat regions detected by RepeatMasker, and grey boxes and shaded areas indicate the internal repeat regions on the Y chromosome.
