macrochaeta & adult thorax | posterior
Heterozygotes show a reduction in the size of the bristles and weak forking of the head and posterior thoracic bristles. The phenotype is partially suppressed by Dp(2;3)P, which presumably carries an active wild-type allele. Homozygotes with Dp(2;3)P frequently survive, are sterile and have extreme forking of all bristles. Interacts with f alleles to produce more extreme forking.
Heterozygote shows reduction in size of bristles and weak forking of head and posterior thoracic bristles. Using Dp(2;3)P, it may be shown that the expression of +/+/Fo1 < +/Fo1 < +/Fo1/Fo1; +/Fo1/Fo1 shows extreme forking of all bristles and is sterile. Homozygous lethal. Fo1 interacts with f alleles to produce extreme forked bristles. RK1.
Forkoid1, funspecified has macrochaeta phenotype