Figure 1.
Grandparental genotypes of males with the Y chromosome of D. sechellia introgressed (A14/Ysech, SR12-2-7/Ysech and G23/Ysech). Grandparental strains with Ysim have the same genotype in the X chromosome/autosome background but are not shown here. Grandparental females of the G23 stock carry the attached X chromosome [C(1)RM]. Y chromosomes switch between males and females each generation along the G23 lineage. White bars represent chromosomes of D. simulans, black bars represent the Y chromosome of D. sechellia.