c. PP
Jake exhibits a dominant trait for polydactyly, thus he must be PP or Pp. Lucy, having a normal toe count, has a recessive genotype, confirming she is pp.
If Jake were Pp, a breeding scenario of Pp X pp would result in half Pp and half pp kittens, indicating some kittens could be born with the recessive trait of 18 toes. However, none of the kittens possess 18 toes, all displaying a range of 21 to 25 toes. Therefore, Jake cannot be Pp .
Jake must be PP, as a cross of PP X pp guarantees that all kittens will have the Pp genotype, demonstrating the dominant pheno-type of polydactyly. Each kitten exhibits more than the recessive count of 18 toes, hence they are Pp. The variability in toe count arises from the trait's variable expressivity.
