33% of the legs of the legs of BM2 hemizygous males have a weak fusion between the fourth and fifth tarsal segments, with the joint not properly differentiated.
Homozygotes have a slight indentation at the anterior edge of the eye.
Phenotype less extreme than that of B1. RK2A.
BarM2 has tarsal segment 4 phenotype, enhanceable by ap[+]/apUGO35
Muller, May 1934.
Muller, 1935.
Induced with: Reverse mutation of v.
Weak allele of B.