A positive correlation between the frequency of In(3R)C
in a population and the frequency of individuals carrying extra bristles has been demonstrated. The correlation has also been demonstrated at the individual level.
Homozygous viable. Crossing over in 3R reduced to 1% between centromere and ss, to 0.2% between ss and e; no crossovers between e and tip of 3R recovered except for rare doubles within inversion.