Hemoglobin H disease is caused by deletion
Correct Answer: Three a globin chains
Description: Ans. (c) Three a globin chains(Ref: Robbins 9th/pg 638)Classification of a-thalassemia:Normally 4 a-genes synthesize: 2 a chains -> a, a / a, aMost common cause of a -thalassemia is a -gene deletion (frame-shift mutation)9
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