Aberration Dmel\R(1)1

General Information
Symbol	Dmel\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)
Recent Updates
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FB2013_03
FB2013_02
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Nature of the Aberration
Cytological Order	\| 1A - 20 . 20F - 20C \|
Progenitor	C(1)RM
Mutagen	spontaneous
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 Name
Gene Deletion & Duplication Data
Genes Deleted / Disrupted
Complementation Data
Molecular Data
Genes NOT Deleted / Disrupted
Complementation Data
Molecular Data
Genes Duplicated
Complementation Data
Molecular Data
Genes NOT Duplicated
Complementation Data
Molecular Data
Related Comments

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 ( 1 )
Bloomington	707 R(1)1, y¹/Dp(1;Y)y⁺/C(1)DX, y¹ f¹
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 & Secondary IDs ( 4 )
Reported As
Symbol Synonym	R(1)1 X^c X^O
Name Synonym	Ring (1)
Secondary FlyBase IDs

References ( 7 )
Research paper	Brown et al., 1962, Genetics 47: 1573--1579 Somatic crossing-over and elimination of ring X chromosomes. [FBrf0014617] Muller, 1956, D. I. S. 30: 140--141 Another entire inversion formed by opening of a ring X. [FBrf0010708] Schultz and Catcheside, 1938, J. Genet. 35: 315--320 The nature of closed X-chromosomes in Drosophila melanogaster. [FBrf0004315] Morgan, 1933, Genetics 18: 250--283 A closed X chromosome in Drosophila melanogaster. [FBrf0002555] Morgan, 1926, Proc. Natl. Acad. Sci. U.S.A. 12(3): 180--181 Correlation between shape and behavior of a chromosome. [FBrf0001510]
FlyBase analysis	FlyBase, 2007, En masse symbol-based assigment of Aberration Class with respect to wild type. En masse symbol-based assigment of Aberration Class with respect to wild type. [FBrf0191808]
Book	Lindsley and Zimm, 1992, The Genome of Drosophila melanogaster. The Genome of Drosophila melanogaster. [FBrf0066905]