The given question is asking the phenotypic nature of the individual and the sex of the individual represented in the pedigree given shows the passing of polydactyly (P) by person III-9.
In any family pedigree if the symbol is a circle it represents the female individual and if the circle is filled then it is diseased or affected female, however, in this question the symbol is an empty circle that represents a normal female.
a theory is usually supported by evidence or another laws rules. it must have pretty strong evidence, but it can NOT become a law. a law is set in stone, and proved by math.
