As in wild type, th¹ mutant bursCCAP neurons undergo programmed cell death shortly after eclosion.

As in wild type, th¹/th⁴ mutant bursCCAP neurons undergo programmed cell death shortly after eclosion.

The arista of th¹ flies lacks all lateral branches.

Homozygous mutant or th¹/Df(3L)th102 animals have abnormal aristae, they show an almost complete lack of branching, though the strength of this phenotype is variable. Often, a few short extensions (usually shorter than the dorsal laterals) can be seen projecting from various locations along the central core, though not in any clear pattern. In the antennal imaginal discs of third instar larvae, there is a considerable increase in the number of apoptotic cells near the aristal progenitor cell cluster compared to wild-type. But at other stages, cell death appears normal.

Arista lack the normally occurring side branches.

Geotaxis score significantly lower than for Canton S in a Hirsch-type geotaxis maze.

Aristae threadlike, without side branches. Mutation affects development of tarsal claws at 29^oC (Mglinetz and Ivanov, 1975). Deficiency for th homozygous lethal (Ward and Alexander, 1957; Korge, 1972). Mutant males and females less successful in mating than wild-type (Burnet, Connolly and Dennis, 1971).

Diap1^th-1 has arista phenotype, suppressible by Drice^Δ1

Diap1^th-1 has arista phenotype, suppressible by Dark^CD4

Diap1^th-1 has arista lateral phenotype, suppressible by Dark^CD4

Diap1^th-1/th[+] is an enhancer of eye phenotype of Lrrk^I1915T.UAS, Scer\GAL4^GMR.PF, foxo^UAS.cKb

Diap1^th-1 is an enhancer of phenotype of al¹