Fig. 1

Single pair matings leading to female- and male-informative backcross families. Sex chromosome states: Ws and Zs are the selection line female (W) and male (Z) sex chromosomes, Wu and Zu are from unselected virescens. Circles = females, squares = males. CvSel = C. virescens selection line, CvSF = female-informative backcross; CvSM = male-informative backcross