Table 1.

Deficiency and complementation mapping of an inviability gene on the introgression subline

Tester	Genotype of tester strain						No. of flies		χ2 test
	sna	lace	CycE	[l(2)35Df	l(2)35Di	Gli]	Cy	Non-Cy
Df(2L)b88c75	X	X	X	X	X	X	186	0
Df(2L)TE35D-GW1	X	X	X				311	0
Df(2L)Scorv25	X	X					335	148	NS
Df(2L)Scorv19	X						346	193	NS
snaHG31	X						367	215	NS
laceHG34		X					374	159	NS
CycETE35D			X				269	0
CycEPZ05206			X				135	0
l(2)35DfP15				X			464	222	NS
l(2)35DiRAR8					X		489	270	NS
GliP29						X	556	314	NS

Int(2L)D+S/CyO females were crossed to the tester strains, which are Df/CyO (the top four) or m/CyO (the bottom seven), where Df and m are a deficiency and a mutation, respectively. The numbers of Cy and non-Cy flies from each cross are presented. Because CyO homozygotes are inviable the ratio of Cy/non-Cy is expected to be 2:1 if the tester does not carry a mutation allelic to the inviability gene in the introgression. The genotypes of the tester strains at each of the six loci are shown, with X denoting a null or mutant allele at that location. For example, the first deficiency is null at all six loci, the second one at three loci, and so on. The order of the last three loci (delineated with square brackets) is not known. The breakpoints of deficiencies are based on ref. 32 (J. Roote, personal communication). NS, not significant.