Homozygous and Cyt-b5k14202/Cyt-b5k09716 females and males produce few progeny, even when mated with wild-type flies, and the mutant females lay few eggs.
Cyt-b5k14202/Cyt-b5k09716 larvae contain large numbers of circulating lamellocytes (these are not found in normal larvae). Lamellocytes are more prevalent in larvae containing small melanotic tumours, while plasmatocytes are more abundant in larvae containing large melanotic tumours.
All larvae and adults exhibit melanotic tumour formation. Adult tumours are in the abdomen and occasionally in the head and thorax.