Removal of maternal <i>msls</i> reduces female viability when female determining gene dose is compromised.

Genotype of mothers shown on x-axis; percent female viability relative to their brothers is shown with percentage standard error. (A) Ore R or homozygous mle1, msl-1L60, msl-21 or msl-31 females mated to y, w, cm, SxlfP7B0/Y (test classes total n = 439, 1088, 522, 489, 1065, respectively). Females homozygous for the SxlfP7B0 deficiency are lethal but males with the deficiency are viable. (B) Ore R or homozygous mle1, msl-1L60, msl-21 or msl-31 females mated to w, sis-bsc3-1, sis-a1, m/Y (test classes total n = 270, 934, 593, 849, 555, respectively).