FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Aberration: Dmel\R(1)1
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General Information
Symbol
R(1)1
Species
D. melanogaster
Name
Ring (1)
FlyBase ID
FBab0005890
Feature type
ring_chromosome
Computed Breakpoints include

1A;20B-20C

Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order

| 1A - 20 . 20F - 20C |

Progenitor
C(1)RM
Mutagen
spontaneous
Class of aberration (relative to wild type)
ring_chromosome
(FlyBase, 2007)
Class of aberration (relative to progenitor)
ring_chromosome
Breakpoints
Causes alleles
Carries alleles
y1
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments
Comments on Cytology

All limits 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

    Male and homozygous female have reduced viability; X/0 male lethal (Schultz, 1941, Proc. Int. Congr. Genet., 7th., pp. 257-62). Somewhat unstable, tending to be eliminated during mitosis. Shows about 5 times as much somatic crossing over as rod X (Brown, Walen and Brosseau, 1962, Genetics 47: 1573-79). Crossing over reduced in ring/rod heterozygote; only double crossovers recovered. Exceptional males result from 4-strand double crossing over in R(1)1/+ female.

    Stocks (0)
    Notes on Origin
    Discoverer

    L. V. Morgan, 1922.

     
    Balancer / Genotype Variants of the Aberration
     
    Separable Components
     
    Other Comments
     

    May open out into a rod <up>e.g., In(1)EN</up> spontaneously in stock.

    Synonyms and Secondary IDs (4)
    Reported As
    Symbol Synonym
    R(1)1
    XO
    Xc
    Name Synonyms
    Ring (1)
    Secondary FlyBase IDs
      References (7)