Effects of changes in the dose of genes encoding the U1 snRNP protein U1-70k or the U2 snRNP protein SF3a60 (noi) on the sexual differentiation of SxlMf1/Y male forelegs. Phenotype classes are defined in Fig. 2. Crosses: (A) w SxlMf1ct6/FM7c, B ☿☿ × ♂♂ w/Y; P{snf+w+mC}108/+. (B) w SxlMf1 ct6/w; P{U1-70K+w+mC}Hcter/+ ☿☿ × ♂♂ w/Y; P{U1-70K+w+mC}Hcter/+. (C) w SxlMf1ct6/w; P{noi+w+mC}A71/+ ☿☿ × ♂♂ w/Y; P{snf+w+mC}108. (D) w SxlMf1ct6/w; U1-70K62/SM6β Cy, Roi ☿☿ × ♂♂ w/Y; U1-70K62 P{snf+w+mC}108/+. (E) w SxlMf1 ct6/w; noi2-P{w+mC}/TM2,Ubx ☿☿ × ♂♂ w/Y; P{snf+w+mC}108/+; Ki/Df(3R)noi-D. (F) y w/w SxlMf1ct6; TM3, Sb/noi2-P{w+mC} ☿☿ × ♂♂ w/Y; P{snf+w+mC}108 and P{snf+w+mC}19/+; Df(3R)noi-D./TM3, Sb.