Albinism and phenylketonuria are disorders due to

The correct option is B Recessive autosomal genes

Genes control various traits in an organism through a control exercise on the developmental process. If genes are recessive, they fail to perform the function. Phenylketonuria and albinism are caused due to the presence of recessive autosomal genes. Phenylketonuria is dry to the accumulation of phenylpyruvic acid and causes mental disorders. Albinism is due to the absence of melanin pigment and individuals suffering from this disease are incapable of converting dihydroxyphenylalanine into melanin.

So, the correct answer is 'Recessive autosomal genes'.