Figure 4

Interaction of factor 1 with different genetic backgrounds of D. simulans. Progeny size resulting from the presence of two copies of D. mauritiana introgression P32.75 (black columns) and P32.110 (white columns) in different D. simulans backgrounds. The HMS factor 1 is present in homozygous condition in P32.110 and clearly causes a reduction in fertility for every background tested. Vertical bars indicate the standard errors.