Medicine Thalassemia cd233372 HbH is characterized by? A Deletion of three alpha chain genes B Deletion of three alpha chains and one beta chain genes C Deletion of two alpha and two beta chain genes D Deletion of four alpha chain genes High-Yield Explanation Alpha -Thalassemia Silent carrier state 1 gene deletion -a a a a thalassemia trait 2 gene deletion -a-a HbH disease 3 gene deletion - - -a Hydrops fetalis 4 gene deletion - - - -