FB2026_03 , released September 17, 2026
Aberration: Dmel\In(1)Basc
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General Information
Symbol
In(1)Basc
Species
D. melanogaster
Name
FlyBase ID
FBab0004219
Feature type
chromosomal_inversion
Also Known As
M-5, Muller-5
Computed Cytological Breakpoints (relative to progenitor)
Sequenced Breakpoints (relative to progenitor)
Member of large scale dataset(s)
Nature of Aberration
Cytological Order

1Lt-1B3 | 20F-11A1 | 6F-10F10 | 6F-1B3 | 20F-1Rt

(Bloomington Drosophila Stock Center, 2026.6.26)
Progenitor
In(1)S
In(1)scS1Lsc8R
Mutagen
recombination
Class of aberration (relative to wild type)
chromosomal_inversion
Class of aberration (relative to progenitor)
Cytological Breakpoints (relative to progenitor)
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments
Comments on Cytology
Sequence Crossreferences
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Complementation Data
Completely deleted / disrupted
Partially deleted / disrupted
Molecular Data
Completely deleted
Partially deleted
Genes NOT Deleted / Disrupted
Complementation Data
 
Molecular Data
 
Genes Duplicated
Complementation Data
Completely duplicated
Partially duplicated
Molecular Data
Completely duplicated
Partially duplicated
Genes NOT Duplicated
Complementation Data
 
Molecular Data
 
Affected Genes Inferred by Location (0)
    If no genes are listed here, it may be because the affected region is very large. The JBrowse insert above may show an error for the same reason, and other FlyBase tools such as CytoSearch may also fail for large regions. You can contact FlyBase for more help.
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    Phenotypic Data
    In combination with other aberrations

    Df(1)N55l/In(1)Basc flies show medium notching of the wings.

    (Hillman, 1958)
    NOT in combination with other aberrations

    In(1)scS1Lsc8R and derivatives carrying this inversion carry two copies of the sc transcription unit, but neither copy is expressed normally, so flies have incompletely penetrant missing or duplicated macrochaetae phenotypes. In other words, the combination of the scS1 and sc8 alleles on the same chromosome produces mutant phenotypes.

    (Cook, 2018.3.21)

    Female viable and fertile. Male viable and fertile. X0 male poorly viable.

    Stocks (0)
    Notes on Origin
    Discoverer
     

    Consists of two inversions, In(1)scS1Lsc8R and In(1)S (the two together have been called "In(1)sc[S1L]sc[8R]+S") (FBrf0007148).

    (Parks and Cook, 2026.8.6)
    Balancer / Genotype Variants of the Aberration
    Separable Components
     
    Other Comments
     

    Basc variants exist carrying different markers. The following is a list of the most commonly used variants and their markers. asc : sc[8] sc[S1] w[a]. Bascy : y[82] sc[8] sc[S1] w[a] Bar[1]

    (Parks and Cook, 2026.8.6)

    Routinely used in the detection of sex-linked recessive lethals. Suppresses crossing over in X, but less so than In(1)Insc.

    Synonyms and Secondary IDs (8)
    Reported As
    Symbol Synonym
    Basc
    (Parks and Cook, 2026.8.6)
    In(1)-Muller-5
    (Chadov and Chadova, 1994)
    In(1)Basc
    (Hutter, 1990)
    In(1)scS1Lsc8R+In(1)S
    In(1)scS1Lsc8R+S
    (Bloomington Drosophila Stock Center, 2026.6.26)
    M-5
    (Engels et al., 1990, Golic, 1990, Hillman, 1958)
    Muller 5
    (Golic, 1990)
    Muller-5
    (Engels et al., 1990, Luning, 1953)
    Name Synonyms
    Secondary FlyBase IDs
      References (20)