|Also Known As||Xc2|
|Computed Breakpoints include||1A3-1A4;19F1-20A1|
|Member of large scale dataset(s)|
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|Nature of the Aberration|
|Class of aberration (relative to progenitor)|
|Formalized genetic data|
|Genetic mapping information|
|Comments on Cytology|
All limits from polytene analysis (citation unavailable)
|Gene Deletion & Duplication Data|
|Genes Deleted / Disrupted|
|Genes NOT Deleted / Disrupted|
|Genes NOT Duplicated|
|In combination with other aberrations|
|NOT in combination with other aberrations|
More viable than R(1)1; X/0 male survives. Ordinarily, ring elimination less than 1% (Battacharya, 1950, Proc. R. Soc. Edinburgh, B 64: 199-215; Braver and Blount, 1950, Genetics 35: 98), but nearly 20% of the first progeny of 11-day-old females crossed to ring-bearing males are gynandromorphs (Hannah, 1955, Z. Indukt. Abstamm. Vererbungsl. 86: 600-21). Number of male nuclei in eggs of gynandromorphs varies greatly, suggesting that loss of the ring X may occur more than once and that it may take place as late as the ninth cleavage (Zalokar, 1980, Cell 19: 133-41). Crossing over reduced in ring/rod heterozygote; only double crossovers recovered. Exceptional males result from 4-strand double exchange in R(1)2/+ female.
|Stocks ( 14 )|
|Notes on Origin|
Beadle, 34b (ring nature discovered by Boche).
Induced on: C(1)RM y+.
|Balancer / Genotype Variants of the Aberration|
R(1)2 chromosome from Bowling Green stock center found to carry an allele of bb, named bbBG.
Ring may open out spontaneously in stock <up>e.g., In(1)EN2</up>.
|Synonyms & Secondary IDs ( 3 )|
|Secondary FlyBase IDs|
|References ( 20 )|