The pedigree shows the inheritance of an autosomal recessive disorder. what is the genotype of steve and sonya's son?

The answer is pp

Explanation:

Steve and Sonya's son genotype is pp. Because an inheritance of autosomal recessive disorder  is with recessive allele responsible for the exceptional phenotype. In this case, Steve and Sonya are both heterozygotes, Pp, which means they both have a p allele  because each one gave the boy a p, contributing to affect his son. And since we are talking about inheritance of an autosomal disorder, we know that the parents phenotypic proportions are the same.