Final answer:
Sam could potentially have Blood type B or Blood type O, due to the genotypes of his parents. His mother's ii genotype and his father's BO genotype limit the possibilities to these two types, with Blood type A and Blood type AB being impossible in this scenario.
Step-by-step explanation:
When considering the ABO blood groups, a person's blood type is determined by the alleles they inherit from their parents. Sam's mother has type O blood, which means her genotype is ii, as O is recessive. Sam's father has type B blood with a genotype of BO, where B is dominant and O is indicated by the allele i. To determine the possible blood types for Sam, we can construct a Punnett square. The mother can only contribute the i allele, and the father can contribute either B or i. This results in two possible genotypes for Sam: Bi (which would result in Blood type B) or ii (which would result in Blood type O). Other types, such as Blood type A or Blood type AB, are not possible with these parental genotypes.