Table 4.

Increased maternal snf⁺ dose kills sensitized sons

Progeny class (cross†)	P{snf+} dose in mothers	snf1621SxlM6/Y sons, relative viability*	X∧X/Y siblings as viability reference, n
1 (A)	0	104%	270
2 (B)	1	15%	296
3 (C)	2	0%	137

^*These sons did not carry P{snf⁺}. The 100% viability values for males were estimated by multiplying the number of female sibs with the same snf⁺ genotype by the ♂/♀ ratio for the progeny from y w f:=/Y; P{snf⁺w^+mC}108 P{snf⁺w^+mC}19/+ ☿☿ × ♂♂ w¹¹¹⁸/Y. 

^† A, y w f:=/Y ☿☿ × ♂♂ y w snf¹⁶²¹Sxl^M6/Y. B, y w f:=/Y; P{snf⁺w^+mC}108 or P{snf⁺w^+mC}19/+ ☿☿ × ♂♂ same as A. C, y w f:=/Y; P{snf⁺w^+mC}108 P{snf⁺w^+mC}19/+ ☿☿ × ♂♂ same as A. Females for these three crosses were siblings.