Figure 9.

Synteny between B. cucurbitae and D. melanogaster. (A) An analysis for synteny shows how B. cucurbitae (BC) chromosomes correspond to the chromosome arms of D. melanogaster (DM) and the strong conservation of orthologous genes to Muller elements. Orange lines represent orthologous genes between their position on DM chromosome X and their position on BC chromosome 3, blue lines are between DM 2L and BC 5, yellow lines are between DM 2R and BC 6, green lines are between DM 3L and BC 2, purple lines are between DM 3R and BC 4, and red lines are connections between orthologous genes that are not on homologous chromosomes. (B) A dot plot, ordered by Muller element, showing the relationship between gene position in D. melanogaster and the position of its ortholog in B. cucurbitae. A linear regression analysis shows that there is no relationship between the position of an ortholog in a specific D. melanogaster Muller element and the corresponding position of this ortholog in the orthologous B. cucurbitae Muller element, which serves as evidence for widespread intrachromosomal translocations.