Females homozygous for tuh1^h produce adult offspring with significantly more bristles than homozygous tuh1^g or tuh1^g/tuh1^h females. Increased bristle number occurs in the head, thorax and anterior and posterior abdomen. tuh1^h is completely recessive to tuh1^g. The phenotype is temperature sensitive, with the difference in bristle number between the offspring of tuh1^h and tuh1^g homozygous females being greatest at 18^oC. Flies homozygous for tuh1^h develop significantly faster than flies heterozygous or homozygous for tuh1^g at 18^oC, although there is no significant difference in developmental time at 25^oC.

Abd-B^iab9-tuh-3, tuh1^g has visible | recessive phenotype