Karyotype of Drosophila albomicans. (A) Drosophila albomicans male (left) and female (right). Males have a silver patch on the frons. (B) Schematic karyotype of a male D. albomicans. The third autosome pair has fused to the ancestral sex chromosome pair and forms a neo-sex chromosome. Colors represent different ancestral Drosophila chromosome arms (Muller's elements). (C) B chromosomes of D. albomicans. The blue arrow marks a B chromosome.
Zhou et al. BMC Genomics 2012 13:109 doi:10.1186/1471-2164-13-109