Fig. 1. Comparison of mutant phenotypes and embryonic timing. (A) Comparison of Nasonia zygotic headless (hl) and Drosophila zygotic hunchback (hb) mutant phenotypes. The black bars indicate regions with pattern deletions. (B) Comparative timing of embryogenesis in Nasonia and Drosophila. At 25°C, development from gastrulation to hatching is completed in about 20 hours in both insects, but approximately threefold more time is allocated to early development, prior to gastrulation, in Nasonia.