TABLE 1.

Gonadal dysgenesis in the offspring of TP and M′ strains

Stock	P elements present	No. of vials	No. of ♀♀	% GD ± SEa	Strain type
w	None	25b	447	100 ± 0.0	M
w m f	None	30c	366	100 ± 0.0	M
Samarkand (w+)	None	25b	499	97.2 ± 1.9	M
		25c	332	99.7 ± 0.3
Sexi.4(w+)	43d	21b	255	100 ± 0.0	M′
		30c	484	100 ± 0.0
Sexi.7(w+)	33d	21b	359	83.7 ± 4.8	M′
		30c	446	93.7 ± 2.4
M5B#1 (wa B)	57e	24b	421	85.8 ± 3.5	M
		25c	226	95.4 ± 1.4
TP5 (w)	1f	20b	367	50.2 ± 9.1	TP
TP6 (w m f)	1f	21c	202	9.6 ± 2.5	TP
Harwich (w)	NDg	25c	251	0.3 ± 0.3	P

^aUnweighted mean percentage of GD ± standard error.

^bData obtained in conjunction with tests for interactions between TP5 and M′ strains (see Table 2).

^cData obtained in conjunction with tests for interactions between TP6 and M′ strains (see Table 2).

^dP elements localized in euchromatin in polytene chromosomes (from Rasmusson et al. 1990).

^eP elements localized in euchromatin in polytene chromosomes (from Simmons et al. 1987).

^fThe sole P element in these stocks is located at the left telomere of the X chromosome.

^gNot determined.