Lethal and tumour inducing over the MBT chromosome. Homozygotes show the formation of large melanotic tumours. Gaps in somatic pairing are seen in the polytene chromosomes of heterozygous salivary glands. Heterozygotes show resistance to 5mM hydroxyurea and to 1mM methyl methanesulfonate.
Shows weak somatic pairing defect in the salivary chromosomes. Causes strong melanotic tumor formation in larvae. Shows a recessive cell adhesion deficiency in the salivary glands when placed in acidic medium. Shows hyperplasia when heterozygous with the MBT chromosome.