(C) $1$. Hemophilia is an $X$-linked recessive disorder.$2$. Phenylketonuria is an autosomal recessive disorder.$3$. Sickle cell anemia is an autosoma

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Sickle cell anemia $-$ Autosomal recessive trait,chromosome $-11$

(C) $1$. Hemophilia is an $X$-linked recessive disorder.$2$. Phenylketonuria is an autosomal recessive disorder.$3$. Sickle cell anemia is an autosomal recessive disorder caused by a mutation in the gene on chromosome $-11$.$4$. Thalassemia is an autosomal recessive blood disorder.Therefore,the correct pair is $C$.