j:  jaunty
allele	origin	discoverer	ref a	phenotype	
					
 j1	spont	Bridges, 11l11	3, 4, 7		
*j2	spont	Stern, 25d31	7, 8	<j	
*j49j	spont	Mossige	6	<j	
 j50e	spont	Mossige	6	<j	
*j58i	spont	Andrew	1	>j b	
 j63					
 j67b	EMS	Grell	5	>j	
 jSF7	EMS	Littlewood	2	=j	
a

1 = Andrew, 1959, DIS 33:  82;
2 = Ashburner, Faithfull, Littlewood, Richards, Smith,
Velissariou, and Woodruff, 1980, DIS 55:  193-95;
3 = Bridges and Morgan, 1919, Carnegie
Inst. Washington Publ. No. 278:  160 (fig.);
4 = Clausen, 1924, J. Exp. Zool. 38:  423-36;
5 = Grell, 1969, DIS 44:  47;
6 = Mossige, 1951, DIS 25:  69;
7 = Stern, 1927, Biol. Zentralbl. 47:  361-69;
8 = Stern, 1934, DIS 1:  35.
b

Wing bends sharply upward in vicinity of anterior crossvein in
extreme cases, with a small dark blot near vein L3 at level of
deflection.  Anterior crossveins may be reduced or absent.

cytology:  Placed in 34E2.  Within Df(2L)b82a2 = Df(2L)34D2-4;34E1-2
and Df(2L)fn7 = Df(2L)34E2-4;35B3-5, but not in
Df(2L)b82a1 or Df(2L)el80f1 = Df(2L)34E2-4;35C3-5
(Ashburner).

 J:  Jammed 
location:  2-41.0.
origin:  Spontaneous.
discoverer:  Bridges, 23d3.
phenotype:  Wings often compressed into narrow strips, sometimes filled with
fluid.  Alula larger and square tipped with clumped bristles
and bare regions.  Alula modification is characteristicly least
likely to overlap wild type.  Completely overlaps wild type at
19°, almost never at 28° or 30°.  Not lethal when
homozygous; viability, as in heterozygote, about 70% wild
type.  Classifiable in single dose triploids (Schultz, 1934,
DIS 1:  55).  RK1 at 28°-30°; RK2 at 25°.
alleles:  J1 and J34e
(Duncan); like J1
but produces more vigorous stock; RK1 at 28°.  Two
X-ray-induced revertants Jrv99
and Jrv272 are not deficient for flanking markers;
Jrv99 is associated with T(Y;2)Jrv99
(Salas and Lengyel, 1984, DIS 60:  243-44).
cytology:  Salivary chromosomes apparently normal (Bridges in Morgan,
Bridges, and Schultz, 1937, Year Book - Carnegie
Inst. Washington 36:  301).  Placed in 31B-F on basis of region common
to deficiencies recovered as revertants of J (Sandler, 1977,
Genetics 86:  567-82).

Jag:  Jagged
	transcripts	predicted protein	
gene	size (kb)	sex	amino acids	mol. wt.	
					
janA	1.1	males	115	12 kd	
	0.95	males 			
	0.8	males and 			
		females			
janB	0.84	males	140	15 kd	

The cDNA sequences of janA suggests the existence of alternative transcript structures which have not been definitely determined yet.
The size difference between the 0.8 kb and the 0.95 kb transcripts is the result of a difference in length of their poly(A) tails.
The male-specific 0.95 kb janA transcript and the male-specific janB transcript are only expressed in germ line tissues, but the non-sex-specific 0.8 kb janA transcript is known to be expressed in both germ line and somatic tissues since detected in germ-line-less as well as normal adults.
37% of the amino acid residues of the two janus genes are identical at homologous positions and the last two 3   introns of both genes are located at identical positions with respect to their protein-coding sequences, suggesting that janA and janB originated from a duplication of an ancestral transcription unit.

 jaunty:  see j

 jaunty x:  see jyx

 javelin:  see jv

 javelinlike:  see jvl

*je:  jelly 
location:  3-46.
origin:  Spontaneous; arose simultaneously with mussed (3-50).
discoverer:  Mohr, 37l21.
references:  Mossige, 1939, DIS 12:  47.
phenotype:  Dark pinkish eye color.  RK1.

 Jon:  Jonah 
A complex family of about 20 genes distributed at widely dispersed
sites on the chromosomes of Drosophila melanogaster
and expressed only in the midgut of larvae and adults.
The function of the gene products are not known.
The genes are found in small clusters at different chromosomal sites,
as indicated in the following table.

genes	location	cytology a	number of	
(single or			genes at	
 clustered)			site	
				
Jon25B b	2-{13} 	25B	3 	
Jon44E	2-{58} 	44E	1 	
Jon65A b	3-{20} 	65A	4	
Jon66C b	3-{26} 	66C	2	
Jon99C1 g	3-{101} 	99C	2	
Jon99C2 b g	3-{101} 	99C	3	
Jon99F	3-{101} 	99C	2	

a

As indicated by in situ hybridization to the salivaries
(Carlson and Hogness, 1985, Dev. Biol. 108:  341-54).
A weak site at 67B was also identified by long exposure to the label
but no genomic clones were identified
(Wolfner, 1980, Ph.D thesis, Stanford University).
Six gene clusters listed have repeats (direct, inverted, or both).
b

Described in detail at the end of text.
g

Allelic variants at 99C.
Synonym:  JonC a and JonC b.

origin:  From cDNA clones from the poly(A)+ RNA of third instar larvae before the beginning of larvae metamorphosis.
Sites identified by in situ hybridization with the reference cDNA probe.
references:  
 Akam and Carlson, 1985, EMBO J. 4:  155-61.
Carlson and Hogness, 1985a, Dev. Biol. 108:  341-54.
Carlson and Hogness, 1985b, Dev. Biol. 108:  355-68.
phenotype:  The Jon genes are expressed in various regions of the larval midgut
(AMG, MMG, PMG) during all the larval stages
(Akam and Carlson, 1985);
expression disappears at pupation, but reappears in the adult midgut
shortly after eclosion and remains throughout adult life.
molecular biology:  Genomic clones and subclones carrying Jonah genes from different
chromosomal sites were constructed and isolated
(Carlson and Hogness, 1985a, 1985b), revealing a family of imperfectly
repeated genes.
Jonah mRNA is abundant during all three larval instars and in the adult life,
but different Jonah RNA’s show spatial and temporal differences
(Akam and Carlson, 1985; Carlson and Hogness, 1985a).
The mature mRNA is about 910 bp in length and encodes a 28 kd translation product whose function has not been determined
(Carlson and Hogness, 1985b).

 Jon25B 
molecular biology:  mRNA hybridizes strongly to larvae, weakly to adults
(Carlson and Hogness, 1985b).

 Jon65A 
molecular biology:  Weak identity to other Jonah genes.
mRNA hybridizes to both anterior and middle midgut of larvae
(Akam and Carlson, 1985; Carlson and Hogness, 1985b).

 Jon66C 
molecular biology:  mRNA hybridizes to larvae only (Carlson and Hogness, 1985b).

 Jon99C2 
molecular biology:  Shows considerable identity to many other Jonah genes.
mRNA hybridizes strongly to anterior part of the
posterior midgut of larvae
(Akam and Carlson, 1985; Carlson and Hogness, 1985b).

 jpl:  see gfa

 ju:  jumper 
location:  3-91.09 (between se and e).
origin:  Wild population from Yugoslavia.
references:  Lenicek and Sesta, 1986, DIS 63:  163.
phenotype:  Flies have opened wings, oriented at an angle of 65°
with respect to the longitudinal axis, and 10-30°
with respect to the horizontal axis.
Homozygotes show decreased flying ability and move from place to place by jumping.

 Jutas:  see Fs(3)Sz13

 jv:  javelin 
location:  3-19.2 (0.9 unit to left of dv).
discoverer:  Mohr, 31j29.
references:  1937, DIS 8:  12.
Mohr and Mossige, 1943, Skrifter Norske Videnskaps-Akad. Oslo,
I:  Mat.-Naturv. Kl., No. 7.  51 pp. (fig.).
phenotype:  All bristles and hairs cylindrical, instead of tapered, with
small enlargement before tip.  Cell autonomous and useful as a
marker for epidermal clones (Morata and Ripoll, 1975,
Dev. Biol. 42:  211-21).  RK2.
alleles:  jv1 and jv70b.
cytology:  Placed between 64C12 and 65E1 on the basis of its inclusion in
Df(3L)Vn = Df(3L)64C12-D1;65D2-E1.

 jvl:  javelinlike 
location:  3-56.7.
origin:  Spontaneous.
discoverer:  Ives, 40l2.
references:  1942, DIS 16:  48.
phenotype:  Resembles jv but bristles sometimes more crooked.
Viability and productivity somewhat lower than normal.  RK2.

*jyx:  jaunty-x 
location:  1-24.
origin:  Spontaneous.
discoverer:  Bridges, 14i12.
phenotype:  Wings curved up at tips.  Viability about 60% wild type.  RK3.