Final answer:
Wingless engrailed and hedgehog genes are expressed in specific bands during embryonic development, contributing to body segmentation and limb patterning.
Step-by-step explanation:
In embryonic development, the wingless engrailed and hedgehog genes are expressed in specific bands.
In the case of wingless engrailed, it is expressed in alternating bands along the anterior-posterior axis of the developing insect embryo. This pattern is important for the segmentation of the body.
The hedgehog gene, on the other hand, is expressed in stripes or bands within the developing vertebrate limb buds. It plays a crucial role in the patterning of the limb.