(b) Lygaeus mode Figure 5.4(b) Th Lybaeus mode of fttf111 fltt sex determination, Autosomes Xs Autosomes Y where e XX Female(12A.+2X) XY Male(12A: +X+Y hetero gametic sex Gamete Gamete formation XY and formation produces gametes with either an X or ay chromosome H+1+ X Autosomes Y Autosomes Xs Male(12A+X+Y Female(12A+2X) 1: 1 sex ratioFigure 5.4 (b) The Lybaeus mode of sex determination, where the heterogametic sex is XY and produces gametes with either an X or a Y chromosome