Ventral nervous system disorganized and not condensed. Mutants have fewer cells in the CNS; pattern of neuronal connections damaged.
Hemizygous male XO clones develop normally in most adult tissues in gynandromorphs, except that very few completely male genitalia are seen.
White.
Mosaic analysis suggests that vnd function is required in the anterioventral region of the embryo and that the presence of vnd mutant tissue in the thoracic ganglion is not necessarily lethal.