The tips of many bristles and hairs are pale and curved, and bristles are often short (maybe due to the tips being broken off) in heterozygous flies. Expression of the phenotype is increased at lower temperatures.

The tips of many bristles and hairs are pale and curved in heterozygotes. Bristles are often short (maybe due to the tips being broken off). Wild-type bristles sometimes have pale tips, thus interfering with positive classification. Expression of the phenotype is best at low temperatures. RK2.