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The genetics and epigenetic processes associated with morphological organization are a principal aim of biology, ranging from cohesion between cells to shape and size of organisms. We investigate the post-embryonic development of Hypopharyngeal sclerite and cornua HPC and mandibles M of  Drosophila gaucha  larva. Integrated functioning of these Cephalopharyngeal skeleton parts of  D .  gaucha  larva is essential for food acquisition, participating in locomotion and microhabitat selection. We examined two isolates by recording the growth of the HPC and M every 24 h for 8 days in parental, F  1  , F  2   and backcross larvae. In F  1   larvae, the HPC and M growth was similar to the parental. In F  2   and backcross larvae, the growth was slower. Epistasis and dominance are the principal sources upon which the growth of HPC and M are based. Pleiotropic genes seem also to be involved in integrating the development of M and HPC. Our data suggest that hybridization of the isolates modified epigenetic processes involved in the development of those morphological structures of  D .  gaucha  larva.

The genetics and development of mandibles and hypopharyngeal sclerite and cornua in larvae of Drosophila gaucha