Figure 1: This schema presents sex determination by steroid hormones and some SD-genes in Rana rugosa. Testosterone and estradiol-17β are produced in the undifferentiated gonads of males and females, respectively. Sex chromosomes (Z, W) and autosomes (3, 9, 7) were denoted by letters and the numbers, respectively. AR-T and ER-E2 indicate the complexes of steroid receptor. Localization of genes on chromosomes marked lateral line (adopted from [10, 11]).