FB2026_02 , released June 18, 2026
Aberration: Dmel\In(1)l-v227
Open Close
General Information
Symbol
In(1)l-v227
Species
D. melanogaster
Name
Inversion (1) lethal variegated
FlyBase ID
FBab0004143
Feature type
chromosomal_inversion
Computed Breakpoints include

[<2];20F

Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Progenitor
Mutagen
X ray
(Lindsley et al., 1960)
Class of aberration (relative to wild type)
chromosomal_inversion
(FlyBase, 2007)
Class of aberration (relative to progenitor)
chromosomal_inversion
Breakpoints

1-2;19-20

(Lindsley et al., 1960)
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

bk1 << l(1)v227 << bk2

Genetic mapping information
Comments
Comments on Cytology

Right limit of break 1 from polytene analysis (FBrf0013319) Limits of break 2 from polytene analysis (citation unavailable)

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.
    In these cases, there will be no "Export to Hitlist" button to the left.
    Phenotypic Data
    In combination with other aberrations
    NOT in combination with other aberrations

    X/0 males are lethal (relative viability of 0), X/Y males are viable (relative viability of 0.48). Levels of maternal nondisjunction are low. Males are fertile. Recovery of male lethals is reduced when in combination with either E(var)71 or Df(2R)M41A10 : the Y-suppressed lethality is a variegated position effect.

    (Lindsley et al., 1960)

    viability XY: .48 X0 male lethal XY male fertile Enhanced by Df(2R)M41A10 Enhanced by Evar7

    Stocks (0)
    Notes on Origin
    Discoverer
     

    Selected as X chromosomes lethal or semilethal in X0 males, but viable in XY males.

    Balancer / Genotype Variants of the Aberration
     
    Separable Components
     
    Other Comments
     
    Synonyms and Secondary IDs (3)
    Reported As
    Symbol Synonym
    In(1)l-v227
    l(1)v227
    Name Synonyms
    Inversion (1) lethal variegated
    Secondary FlyBase IDs
    • FBal0007907
    References (3)