Fig 1. Key stocks of D. albomicans and D. nasuta used in this study.
(A) Karyotypes of these two species. Robertsonian fusions between the X (Y) and the 3rd chromosomes in their ancestor led to a pair of new sex chromosomes X-3/Y-3 in D. albomicans. Muller’s elements are assigned to chromosomal arms, along with the translocations detected by molecular markers and genetic linkage from this study (S1 Dataset and S1 Table). (B) Stockes used in this study. Shown are fixed inversions and the associated breakpoints for true-bred stocks (alb267 and alb215) derived from alb2, and nas314 and nas384 from nas3, as well as the segregating inversions (shl2-hap1 and shl2-hap2) in shl2. The polytene sequence was determined according to the standard map made from alb267 (S2 Dataset). The centromere position on the “dot” chromosome 4 is not determined.