Table 1.

Relative viabilities of stn/syt double mutants

Sex-chromosome genotype	sytAD4/sytD27 P[elav syt+] (as % of total)	n	Male/female ratio
stnts1/Y	2.3*	399
stnts1/+	21.5	731	0.55
stnts2/Y	5.8*	223
stnts2/+	23.8	416	0.54
stnC/Y	16.9	633
stnC/+	24.9	884	0.72
+/Y	20.6	247
+/+	18.2	248	0.99

+ indicates the presence of a wild-type stoned allele, and Y represents a Y chromosome. n = total number of flies of each sex resulting from the crosses (see Fig. 1).

^*denotes progeny values that are significantly different from expected values. (^*p < 0.001 using contingency χ², actual numbers, not percentages, were used for calculation.)