Lethal and tumour inducing over the MBT chromosome. Homozygotes show the formation of 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 strong somatic pairing defect in the salivary chromosomes. Causes significant melanotic tumor formation in larvae. Lethal when heterozygous with the MBT chromosome. Shows hyperplasia when heterozygous with the MBT chromosome.