Albinism is an inherited condition caused by a recessive allele a. A is the dominant allele for the normal condition. What are the genotypes of individuals R and S?

The correct option is B R = Aa, S=Aa

• In generation 1, the albino male and albino female will have their genotype as "$aa$" (recessive allele for albinism).
• In an autosomal recessive pedigree, normal male and female may have their genotype as "$AA$" or "$Aa$".
• All children in generation 2 are normal. Hence, their genotypes will be "$Aa$" because one of their parent is affected and can only transfer recessive allele to their children.
• In generation 3, there are 7 children (2 normal males, 3 normal females, 1 albino male, and 1 albino female).
• The genotypes of normal children will be "$Aa$", whereas that of albino children will be "$aa$". R and S belong to generation 2, where all the children are normal with their genotype as "$Aa$".

So, the correct answer is option C.