FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Aberration: Dmel\C(1)RM
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General Information
Symbol
C(1)RM
Species
D. melanogaster
Name
Compound (1) Reversed Metacentric
FlyBase ID
FBab0000088
Feature type
homo_compound_chromosome
Also Known As
attached-X
Computed Breakpoints include
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Progenitor
Mutagen
recombination
Class of aberration (relative to wild type)
homo_compound_chromosome
Class of aberration (relative to progenitor)
Breakpoints
Causes alleles
Carries alleles
f1
(The Moscow Regional Drosophila melanogaster Stock Center, Dubna)
mal2
(The Moscow Regional Drosophila melanogaster Stock Center, Dubna)
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments
Comments on Cytology

C(1)RM, +.+; two X chromosomes in normal sequence attached proximally to the same centromere

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
    NOT in combination with other aberrations

    Recombination with the Y chromosome leads to detachments with a frequency of about 10-3 in C(1)RM/Y females. Has been extensively used in studies of crossing over (e.g., Anderson, 1925, Genetics 10: 403-17; Beadle and Emerson, 1935, Genetics 20: 192-206; Welshons, 1955, Genetics 40: 918-36).

    Stocks (282)
    Notes on Origin
    Discoverer

    L. V. Morgan, 12th Feb. 1921.

     

    Recurs regularly by exchange between the heterochromatin of the short arm of one X, XYS, or XYL that of the base of the long arm of a sister or homolog. Can be induced in mature X.YL -bearing sperm (Leigh, 1972, DIS 48: 107). Presumably the pericentric heterochromatic constitutions of independently arising C(1)RM chromosomes varies.

    Balancer / Genotype Variants of the Aberration
    Separable Components
     
    Other Comments
     

    Attached X chromosomes homozygous for various w alleles were used to study dosage compensation of w.

    (Birchler, 1992)

    Exists with many combinations of markers.

    Synonyms and Secondary IDs (6)
    References (31)