Figure 4From: Asymmetrical sexual isolation but no postmating isolation between the closely related species Drosophila suboccidentalis and Drosophila occidentalis Female progeny production. Number of progeny produced by pure species females after conspecific or heterospecific matings. Bars indicate standard errors, and numbers within the bars are sample sizes. “Subo” refers to a D. suboccidentalis and “Occ” refers to D. occidentalis.Back to article page