TABLE 1.

Frequencies of HeT-A/TART attachment in the presence of Su(var)2-5 mutations^a

Su(var) mutation	No. of flies displaying a new y phenotype/total no. in generation:							% Q (F2-F7)b
	F1	F2	F3	F4	F5	F6	F7
If/CyO	1/1,100	2/1,320	0/1,560	1/1,820	0/1,920	2/2,440	1/1,469	0.06
Su(var)2-501	2/740	226/1,253	332/1,817	616/2,211	364/1,271	145/967	143/802	22
Su(var)2-502	6/800	140/983	303/1,122	171/791	108/620	43/273	62/353	20
Su(var)2-504	0/525	181/733	130/515	96/584	18/146			21
Su(var)2-505	0/460	98/820	128/578	70/459	61/311	67/720		14
Su(var)2-5/Dp(2;2)P90				80/806	9/1,457	2/1,365	4/1,417	0.35c

^aThe scheme of crosses is shown in Fig. 2. All tested lines have genotypes y^TD/yac; Su(var)2-5/CyO and y^TD/yac; If/CyO.

^bQ, average frequency of visible events signifying a new y phenotype(s) versus total number of flies scored (as a percentage).

^cIn the case of the Su(var)2-5/Dp(2;2)P90 combination, Q was calculated for generations F₅ to F₇ only.