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General Information
D. melanogaster
FlyBase ID
Feature type
Computed Breakpoints include


Deleted Segment
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Class of aberration (relative to wild type)
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

up << bk1 << mus101 << fs(1)288 << bk2 << na

Genetic mapping information
Comments on Cytology

Left limit of break 1 from polytene analysis (FBrf0040961) Right limit of break 1 from polytene analysis (FBrf0034402) Limits of break 2 from polytene analysis (FBrf0034402)

Sequence Crossreferences
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Genes NOT Deleted / Disrupted
Genes Duplicated
Complementation Data
Completely duplicated
Partially duplicated
Molecular Data
Completely duplicated
Partially duplicated
Genes NOT Duplicated
Complementation Data
Molecular Data
Phenotypic Data
In combination with other aberrations
NOT in combination with other aberrations

No significant change in female lethality when in combination with Sxlf1.

TDT attachment sites vary. The muscle may be found in the wild type position, posterior to the intrascutal suture and displaced medially, anterior to the intrascutal suture or missing entirely. Muscle may also be reduced in size or split dorsally attaching to two separate sites on the scutum. Cytology of the TDT is also altered, muscles may have fibres that are swollen and stain abnormally, other fibres may have large, axially aligned holes. Allelic series of TDT phenotype: benP2/benP2 < benP2/Df(1)HA92 < ben1/benP2 < ben1/ben1 = ben1/Df(1)HA92. Attachment pattern of the DVMs is also altered. DVMs remain within their respective attachment regions or extend into the region normally occupied by an adjacent DVM. DVMs may be entirely missing. Many flies fail to eclose, dying during late pupal stages. Flies that do eclose show impaired motility. Flies can get stuck in their food, falling into the food causes their femurs to become swollen and bent.

Heterozygotes with ben1 display the ben physiological phenotype.

Stocks (2)
Notes on Origin


Balancer / Genotype Variants of the Aberration
Separable Components
Other Comments
Synonyms and Secondary IDs (4)
Reported As
Name Synonyms
Secondary FlyBase IDs
    References (31)