7. Wet ear wax (W) is dominant over dry ear wax (w) W=wet ear wax w=dry ear wax a. A 3:1 phenotypic ratio of F1 progeny indicates that the parents are of what genotype? b. A 1:1 phenotypic ratio of F1 progeny indicates that the parents are of what genotype? Solution Ans: This is the result of a problem common in trying to determine the nature of inheritance patterns in humans. The results are combined from offspring from several families. Thus the sticky x sticky cross includes families in which parents may be (AA x AA; Aa X AA). aa x aa..