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General Information
D. melanogaster
FlyBase ID
Feature type
Computed Breakpoints include
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Class of aberration (relative to wild type)
Class of aberration (relative to progenitor)


Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments on Cytology
Sequence Crossreferences
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
    Phenotypic Data
    In combination with other aberrations
    NOT in combination with other aberrations

    FM7/X females heterozygous for Df(3L)66C-T2-10 show 30.9% X and 19.7% fourth chromosome nondisjunction.

    The primary cytological defect in heterozygous oocytes is malorientation of the nonexchange fourth chromosomes. The majority of spindles appear structurally normal.

    Heterozygosity for Df(3L)66C-T2-10 results in 39.2% X chromosome nondisjunction and 27.7% fourth chromosome nondisjunction in In(1)FM7/X ; svspa-pol females. The level of X chromosome nondisjunction in heterozygous Df(3L)66C-T2-10 females carrying two normal sequence X chromosomes is only 4.0%, while the frequency of fourth chromosome nondisjunction in these females is 42.1%. Achiasmate X and fourth chromosomes are often improperly placed on metaphase I spindles of oocytes in In(1)FM7/X ; Df(3L)66C-T2-10/+ females; achiasmate X chromosomes are found on the same half-spindle 21% of the time and fourth chromosomes are found on the same half-spindle 31% of the time.

    Stocks (0)
    Notes on Origin
    Balancer / Genotype Variants of the Aberration
    Separable Components
    Other Comments
    Synonyms and Secondary IDs (2)
    Reported As
    Symbol Synonym
    Name Synonyms
    Secondary FlyBase IDs
      References (3)