TABLE 3.

Extents and frequencies of elongation of terminal sequences in y^TD2h2 derivatives^a

Generation	Su(var)2-5 mutation	Gene conversionb			DNA attachmentb
		Totalc	Events	% Q	Totald	Events	% Q
F1	Su(var)2-502	1,400	2	0.14	54	1	2
	Su(var)2-505	1,650	3	0.18	69	0	<2
	Su(var)2-5+	1,200	2	0.16	41	0	<3
F2	Su(var)2-502	1,250	186	15	46	3	6.5
	Su(var)2-505	1,900	445	23	72	2	2.8
	Su(var)2-5+	2,100	7	0.33	86	0	<2
F3	Su(var)2-502	900	153	7.9	36	2	5.6
	Su(var)2-505	1,400	302	21.5	44	2	4.6
	Su(var)2-5+	1,600	4	0.25	55	1	2
F4	Su(var)2-502	750	59	20.1	34	1	3
	Su(var)2-505	1,200	168	18.2	48	2	2.1
	Su(var)2-5+	1,450	4	0.28	44	0	<3

^aThe scheme of crosses is shown in Fig. 2.

^bEvents, numbers of females displaying a new y phenotype that is generated either by DNA elongation via gene conversion or by attachment of telomere-specific mobile elements; Q, average frequency of visible events signifying a new y phenotype versus number of flies scored (in percent).

^cTotal number of scored females.

^dTotal number of females examined for attachment of HeT-A and TART.