FB2026_02 , released June 18, 2026
FB2026_02 , released June 18, 2026
Aberration: Dmel\Df(2R)B
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General Information
Symbol
Df(2R)B
Species
D. melanogaster
Name
FlyBase ID
FBab0001940
Feature type
chromosomal_deletion
Computed Breakpoints include

[h39--h41];[h41]

Features within h39--h41
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Progenitor
Mutagen
gamma ray
(Hilliker and Holm, 1975)
Class of aberration (relative to wild type)
chromosomal_deletion
(FlyBase, 2007)
Class of aberration (relative to progenitor)
chromosomal_deletion
Breakpoints
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

Rsp << bk1 << l(2)41Ab << l(2)41Aa << bk2 << rl

Genetic mapping information
Comments
Comments on Cytology

Left limit of break 1 from non-inclusion of Rsp (citation unavailable) Right limit of break 1 from inclusion of l(2)41Aa (citation unavailable) Left limit of break 2 from inclusion of l(2)41Aa (citation unavailable) Right limit of break 2 from non-inclusion of rl (citation unavailable)

Sequence Crossreferences
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Complementation Data
Completely deleted / disrupted
l(2)41Ab
(Cenci et al., 2003, Ganetzky, 1977, Hilliker, 1976, Hilliker and Holm, 1975)
Yeti
(Messina et al., 2014, Cenci et al., 2003, Ganetzky, 1977, Hilliker, 1976, Hilliker and Holm, 1975)
Partially deleted / disrupted
Molecular Data
Completely deleted
Partially deleted
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
 
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

    Df(2R)B/Df(2R)IR7 mutant larvae have abnormal wing discs. Df(2R)B/Df(2R)IR7 mutant larval neuroblast cells exhibit a higher anaphase/metaphase ratio than wild-type cells. The total number of Df(2R)B/Df(2R)IR7 larval neuroblast cells undergoing mitosis is reduced compared to wild-type cells (mitotic index of 0.41 vs 0.81). 25% of Df(2R)B/Df(2R)IR7 mutant larval spermatids carry micronuclei. 12% of Df(2R)IR7/Df(2R)B mutant larval spermatids have large Nebenkerns associated with either two or four nuclei or micronuclei. In 30% of Df(2R)IR7/Df(2R)B mutant larval spermatids, bivalents do not condense properly and chromatin filaments are visible along the three major dots of chromatin. In Df(2R)B/Df(2R)IR7 mutant larval spermatids, 28% of chromosomes are seen to be lagging during anaphase/telophase I, while 21% lag during anaphase/telophase II.

    (Cenci et al., 2003)

    Df(2R)B/Df(2R)M41A4 viable (Hilliker, 1976) Df(2R)B/Df(2R)M41A8 viable (Hilliker, 1976) Df(2R)B/Df(2R)M41A10 lethal (Hilliker, 1976)

    NOT in combination with other aberrations

    83% of Df(2R)B/Df(2R)B mutant larvae show abnormally condensed chromosomes. In Df(2R)B/Df(2R)B mutants, the total number of larval neuroblast cells undergoing mitosis is reduced (mitotic index of 0.2 vs 0.81 for wild-types).

    (Cenci et al., 2003)
    Stocks (0)
    Notes on Origin
    Discoverer
     

    reconstitution of chromosome 2 by detachment of compound second chromosomes (Hilliker and Holm, 1975).

    Balancer / Genotype Variants of the Aberration
     
    Separable Components
     
    Other Comments
     

    Group B deficiencies have been generated from the progenitor genotype of C(2L)RM-SH3 in combination with C(2R)RM-SH3.

    (Hilliker and Holm, 1975)
    Synonyms and Secondary IDs (4)
    Reported As
    Symbol Synonym
    Df(2R)B
    (Messina et al., 2014)
    Df(2Rh)B
    (Cenci et al., 2003)
    DfB
    (Cenci et al., 2003)
    GroupB
    (Hilliker, 1976)
    Name Synonyms
    Secondary FlyBase IDs
      References (7)