Which among the following is an autosomal recessive genetic disorder?

The correct option is D All of these
Thalassemia, sickle cell anaemia and phenylketonuria are autosomal linked recessive genetic disorders as the defective genes responsible for these disorders are located on autosomes.

In thalassemia, the body does not make enough of haemoglobin protein.

In sickle cell anaemia, due to abnormal structure of haemoglobin the RBC's become sickle shaped.

In phenylketonuria, person lacks enzyme responsible for conversion of phenylalanine to tyrosine .