Fig. 1

Theory of the rule of inheritance of whorls. Subjects with a moderate number of whorls had one “whorl gene” and one “other gene”. Thus, for a married couple with a moderate number of whorls, the probability of their children having a high number of whorls (8–10) should be 25 % (whorl gene and whorl gene); the probability of their children having a low number of whorls (0–2) should also be 25 % (other gene and other gene)