The Mutation That Causes Sickle Cell Disease

Multiple Choice

The mutation that causes sickle cell disease

A) occurs in the same gene that, when mutant in a different way, causes beta thalassemia.
B) deletes two contiguous DNA bases.
C) results in a single DNA base change that does not alter the encoded amino acid.
D) changes a valine to a glutamic acid in the beta globin gene.
E) changes a glutamic acid to a valine in the alpha globin gene.